Behaviors – Page 104 – Feathered Photography

The Trouble With Harems

Mia and I spent most of this week on a camping/photography trip to Flaming Gorge, Utah and we had some wonderful photographic opportunities with pronghorns. We camped on an isolated peninsula and it happened that a buck pronghorn was using the topography of the peninsula to help him keep control of his very large harem of females. The herd consisted of the lone buck and many females – both adults and juveniles. The male was in full rut and frantic to keep his does together and prevent several other males from running off with them. Does have varying mating strategies. Some does, called “sampling” females, will visit several males during the breeding season if allowed to do so. Others, referred to as “inciting females”, behave as sampling females until they come into estrus when they move off from the males which incites fights and aggressive competition between the males. These females always immediately mate with the winning male. Some females employ a third strategy where they join a single male and remain with him throughout estrus – these does are called “quiet” females. Canon 7D, 1/800, f/5.6, ISO 640, 500 f/4, 1.4 tc This poor buck was trying to control at least 28 females and was struggling mightily to do so. One evening we were at the bottom of a string of small hills just as the sun was setting (thus the warm, golden light in these photos). The buck and his females were strung out on the crest of several of the hills and one of the does was giving him a hard time by…

Brine Fly Feeding Frenzy at the Great Salt Lake

The Great Salt Lake in northern Utah is a vital resource for many of North America’s birds. The lake is 75 miles long, 30 miles wide and has 1680 square miles of surface area and 335 miles of shoreline. Surrounding the lake are 400,000 acres of wetlands. Roughly 5 million birds of 257 species rely on the lake and those wetlands for food, sanctuary, breeding and as a migratory stopover. And one of the primary reasons the lake is such an asset for them is the endemic brine fly, Ephydra hians. Brine flies can be intimidating because of their massive numbers but they are truly innocuous. They are found only within a few feet of the shore, they don’t bite and won’t even land on humans. And they’re a huge nutritional resource for birds. In the photo above, the blurry brown bits in the background are brine flies in flight that have been stirred up by the feeding California Gull. Different bird species have varying feeding methods with these flies – this species often stakes out a few feet of feeding territory on the shoreline and then rushes through the hordes of flies on the sand, stirring them up, and then snaps them out of the air in large numbers. This bird is looking down the shoreline and preparing for its next run on the flies. Most of the flies are resting on the sand until the bird makes its run. As the gull rushes along the shoreline the flies are disturbed into the air and the bird snaps…

American Avocet Mating Displays

I’ve been fascinated by the mating displays of American Avocets ever since I first started photographing them almost five years ago. This innate and complex choreography is almost identical in different mated pairs and from year to year. The action happens quickly and is difficult to photograph well but I think I have enough decent images now to make an informative post about it. Not all of the photos are of the highest quality but I think each of them illustrates the behavior well. I’ll present several sequences of different birds that will illustrate most of the important stages of the process. I’m not going to include my techs with these shots -some of them were taken when I first started photographing birds and I made many mistakes in my setting choices. Knowing some of these settings wouldn’t help anyone. Avocets are monogamous and pairs form up in the spring when the female persistently associates with the male until she is eventually tolerated, then accepted as a mate. The female initiates copulation by the posture you see above. It’s called Solicitation Posture and in it she holds her neck extended far out and low. At times it’s so low that much of the head, bill and neck are under water as you’ll see in a later image. Once interested, the male performs Sexual Preening where he stands close to the female and extends his neck so that his bill tip can preen his breast (always on the side closest to her). You’ll see that part of Sexual Preening in a later image but…

The Shot That Broke My Heart

There was a range fire on the north end of Antelope Island yesterday that forced managers to clear out all campers from the campgrounds. So when we arrived early this morning the campgrounds were empty and this young coyote was hunting on the edge of Bridger Bay Campground. Canon 7D, 1/2500, f/6.3, ISO 500, EV +0.33 Normally the coyotes on the island are elusive and difficult to approach but I believe this to be a young one so it didn’t seem overly concerned about us. Besides, he/she obviously already had a quarry in sight deep in the grass and wasn’t about to let us interfere with the hunt. In this image the coyote has just spotted something of interest in the grass some distance in front of “him”. Canon 7D, 1/1600, f/8, ISO 500, EV +0.33 Here the coyote begins to make his stalk. At first he didn’t crouch down so that he could see what ever it was he was after through the grass. Canon 7D, 1/1250, f/8, ISO 500, EV +0.33 But as he got closer (both to the potential prey and to me) he began to crouch down, almost in a cat-like manner. At this point I suspected that something dramatic might happen and tried to prepare myself for “the shot”. The most common prey of coyotes on the island is voles but I was pretty sure it wasn’t a vole because the coyote was too far away from his point of interest when he first spotted it to…

Savannah Sparrows – a Bug’s Worst Enemy

On a recent camping trip to Red Rock Lakes National Wildlife Refuge a rustic old fence near where we camped was the staging area for several hunting Savannah Sparrows. They obviously had nests in the grass nearby and would regularly perch on the fence with prey in their beaks after hunting deep in the grasses. Canon 7D, 1/2500, f/7.1, ISO 640, EV -0.33, 500 f/4, 1.4 tc Boy, did they eat a lot of bugs! Most any kind of Arthropod seemed to be an acceptable part of their diet but this critter was one of their favorites. I believe it to be a dragonfly larvae. Canon 7D, 1/800, f/6.3, ISO 640, EV +0.33, 500 f/4, 1.4 tc When they returned to the fence line they would often have multiple prey in their beaks. I expected them to either immediately consume it or deliver it to the nest but that seldom happened. Instead they would typically hang around on the fence for extended periods of time with the prey still in their beaks – often for 10 minutes or more before eating it or flying off to their nest with it. I can’t explain the behavior but I’m certainly not complaining about it because that little behavioral quirk gave me many opportunities to photograph them with their bills full of interesting tidbits. Canon 7D, 1/2000, f/7.1, ISO 500, EV +0.00, 500 f/4, 1.4 tc Their diet wasn’t limited to insects either, as it wasn’t unusual to see them with spiders. Canon…

Raptors Mobbing Raptors

Mobbing is an antipredator behavior where animals mob a predator by cooperatively attacking or harassing it. This behavior is especially common in birds during nesting and rearing of young. Typically, it will be a flock of passerines like Red-winged Blackbirds mobbing a raptor or perhaps a magpie or any other bird they consider to be a threat to their nest or young. In mid-June of this year while Mia and I were on another one of our camping/photo forays to Red Rock Lakes National Wildlife Refuge we witnessed a somewhat unusual display of mobbing – raptors mobbing raptors. We had just returned to our camping trailer when Mia noticed this sub-adult Bald Eagle resting on a muskrat mound almost a quarter-mile away across Lower Red Rock Lake – too far away for quality photos (we had marginal light too) but we simply can’t resist training our lenses on a situation like this just to see if something interesting might happen. And this time it did. Canon 7D, 1/800, f/6.3, ISO 500 ev +1.33, 500 f/4, 1.4 tc The eagle seemed to be minding its own business and just hanging out for a while on the mound. Canon 7D, 1/640, f/6.3, ISO 500 ev +1.33, 500 f/4, 1.4 tc But soon a Short-eared Owl (a male I believe) appeared on the scene and he was not happy with the presence of the eagle. My presumption is that the owl had a nest in the area and it felt the eagle threatened the nest or young. Canon 7D, 1/1000, f/6.3, ISO 800 ev +1.00,…

Avocets and Phalaropes in a Hailstorm

Recently I’ve been tardy in posting on this blog because Mia and I just recently returned from one of our favorite camping/photo destinations – four days at Red Rock Lakes National Wildlife Refuge. This trip was a memorable one (as they always are at RRL). Canon 40D, 1/200, f/16, ISO 500 @35mm, ev 0.0 5:30 pm. We were photographing American Avocets and Wilson’s Phalaropes on one of the refuge ponds when we looked behind us to the west and saw this impressive storm heading our way. It was really dumping on the foothills surrounding the valley and we figured things might get interesting so we decided to stay at the pond and see what happened. Good thing we were shooting from my pickup or we’d have been in trouble… Canon 40D, 1/250, f/16, ISO 500 @17mm, ev +0.33 5:52 pm. The slow-moving storm took a while to get to us but when it did it was impressive. It began to rain very hard. It was so intense that neither of us could keep water off of our lenses – in spite of the 7″ long hood on the end of my 500mm lens. I love my new Ford F-150 pickup but the engineers did a poor job on the roof rain channels and water simply poured in off the roof whenever a window was down. As you can see in my side mirror, Mia (who shoots from the back seat) has taken a temporary respite from the downpour and has her lens pulled in and her window…

Short-eared Owls Defending Their Nest Against Predators

Recent reports from others indicate that bird activity on Antelope Island is slowing down now and our experience out there recently would agree with that assessment so yesterday when Mia and I were trying to decide where to go shooting birds we were a little hesitant about another trip to the island. But even with things slowing down we almost never fail to find something interesting to photograph and yesterday was certainly no exception! Canon 7D, 1/800, f/7.1, ISO 500, EV 0, 500 f/4, 1.4 tc Soon after arriving on the island we noticed a pair of Short-eared Owls, obviously mated based on their behavior. Canon 7D, 1/1000, f/7.1, ISO 500, EV 0, 500 f/4, 1.4 tc This owl was carrying a vole and we immediately suspected that the pair had a nest in the vicinity, which turned out to be true. It was quite a distance from the road and buried in vegetation but we could tell its location by watching this owl deliver food to the nest site – either to the mate or to both the mate and chicks. We watched and photographed the birds for a while but when things slowed down we went further down the island. Canon 7D, 1/1600, f/8, ISO 640, EV + .67, 500 f/4, 1.4 tc On our return to the area of the nest we immediately saw a quickly developing drama. A young coyote had apparently just crossed the road and was approaching the nest area and the owls were in…

White Pelican Stretching Pouch in Flight.

American White Pelicans are known to do some pretty strange things with their pouch – one of them is pouch stretching (I’ve been unable to find an official term for the behavior). A four year old image – I no longer have the original file so can’t access exif data They pull their head back and force their very flexible pouch down over their neck and upper chest in a process that looks, well.. bizarre. I don’t think this behavior is particularly unusual as I’ve seen and photographed it several times. According to Birds of North America Online the function of this display is “uncertain”. Canon 7D, 1/5000, f/6.3, ISO 500 However, these birds are also fully capable of pulling the bottom of their pouch up above the level of the lower mandibles without having to pull the pouch down over their neck. I don’t fully understand how they’re able to do this since the pouch itself is non-muscular. Internet research on the subject has been unproductive. I assume there must be some form of bony or cartilaginous rod that extends from the throat area down the middle of the bottom of the pouch about half way to the tip of the bill. With muscular control of the base of that extension in the throat area they would be able to raise the bottom of the pouch above “horizontal”. I’ve seen them do it twice – the first time without a camera while the bird was perched. But the second time, a couple of weeks ago, it was done in flight which…

Agonistic (fighting) Behavior in Male Short-eared Owls

I recently returned from one of my favorite places in the world – Red Rock Lakes National Wildlife Refuge. Last year I was able to photograph nesting Short-eared Owls carrying voles to their young but this year, because of the very cold spring, nesting hadn’t even begun. Instead the owls were competing for territory and mates and pairing up. On one morning I was incredibly lucky to find two males trying to impress a female with their aerial prowess and fighting skills. They were so engrossed in their activities that they pretty much ignored me. Canon 7D, 1/2000, f/7.1, ISO 500, 500 f/4, 1.4 tc Often one male would be on the ground when the other male would swoop in on him. Here the foreground bird has just lifted off to meet his adversary. Canon 7D, 1/2000, f/7.1, ISO 500, 500 f/4, 1.4 tc As was often the case the birds didn’t make actual contact. In researching this behavior I’ve learned that they will sometimes lock talons and fall to the ground before releasing. I suspect that as they rush toward each other they look for a weakness in defense – if they spot one in the other birds defensive body position they would likely make aggressive contact. Canon 7D, 1/2000, f/7.1, ISO 500, 500 f/4, 1.4 tc Most of the time both birds stayed on the ground or flew very low but occasionally one of the owls would fly several hundred feet up and circle over the other male (and the female, who was…

A Willet Expelling a Pellet

Yesterday I got a shot of a Willet expelling a pellet. It’s a behavior I’ve seldom seen and rarely photographed because it typically happens very quickly, many birds don’t do it at all and it often occurs only once per day or so with many species. A pellet, sometimes referred to as a bolus, is a clump of indigestible material that is formed in the crop and eventually regurgitated. Depending on the diet of the bird it may be made of feather, bone, fur and/or chitin from insect or crustacean exoskeletons. Canon 7D, 1/4000, f/6.3, ISO 500, 500 f/4, 1.4 tc At first I wasn’t taking many photos of this Willet because its lower legs were cut off by the rock perch but I did adjust my settings for quick action in case it took off or performed some other interesting behavior. Canon 7D, 1/3200, f/6.3, ISO 500, 500 f/4, 1.4 tc The first indication I got that something might happen that would be interesting to photograph was when the bird pulled down its neck and there was a slight bulge in the throat. Canon 7D, 1/3200, f/6.3, ISO 500, 500 f/4, 1.4 tc Then the Willet began trying to expel the pellet. Canon 7D, 1/3200, f/6.3, ISO 500, 500 f/4, 1.4 tc What happens next appears to look almost like a gagging reflex. Canon 7D, 1/3200, f/6.3, ISO 500, 500 f/4, 1.4 tc The pellet popped out so quickly that I didn’t even see it through the viewfinder…

The Coyotes and the Plucky Pronghorn

Yesterday Mia and I were witness to quite the little drama on a trip to Antelope Island to photograph birds. It all started when we noticed the frantic calling of a Long-billed Curlew which flew over us several times in obvious distress. Canon 7D, 1/2500, f/6.3, ISO 640, 500 f/4, 1.4 tc At first we didn’t know what was causing all the ruckus but soon Mia spotted this coyote. A couple of minutes later we noticed a second coyote nearby. We suspect that the curlew had a nest in the vicinity and it was disturbed by the foraging coyotes. Soon both coyotes disappeared into a ravine but we hung around hoping for more flight shots of the curlew. Canon 7D, 1/1600, f/7.1, ISO 640, 500 f/4, 1.4 tc Then, almost a quarter-mile away, we spotted the coyotes again but this time a doe Pronghorn (at least I think it’s a female and not a young male) had entered the scene. There was obviously going to be a confrontation and at first I assumed that the coyotes would be the aggressors but I was quickly proven wrong. Canon 7D, 1/1600, f/7.1, ISO 640, 500 f/4, 1.4 tc This doe had pluck! After a few seconds of staring each other down the pronghorn charged the coyote on the right. Canon 7D, 1/1600, f/7.1, ISO 640, 500 f/4, 1.4 tc That coyote beat a hasty retreat but the teamwork the coyotes showed was impressive. They always stayed a short distance apart and whenever the doe would…

Common Raven Disposing of Eggshells

When this Common Raven landed on a large rock fairly close to me last week on Antelope Island I could see that it had something in its beak and assumed that it was some type of food. It wasn’t until I got home and processed the images that I could tell what it was. Canon 7D, 500 f/4, 1.4 tc, 1/2500, f 6.3, ISO 500 It turns out that it was eggshell, presumably from its own nest. In researching Common Raven eggs I found that they have this kind of marking and color (though there is some variability in both) and this shell remnant seemed to be about the right size for a raven so my assumption is that it’s a raven eggshell and not leftovers from a meal from raiding the nest of another bird. There is a raven nest relatively close to this rock. Canon 7D, 500 f/4, 1.4 tc, 1/2500, f 6.3, ISO 500 Here the raven is very carefully placing the shell in a crevice in the rocks. At the time I took the photo I couldn’t figure out why the bird would simply abandon what I thought was food. Canon 7D, 500 f/4, 1.4 tc, 1/3200, f 6.3, ISO 500 Here the raven has dropped the eggshell… Canon 7D, 500 f/4, 1.4 tc, 1/2000, f 7.1, ISO 500 and then it hopped to the peak of the rock to “crow” about its accomplishment. Birds of North America Online says this about raven eggshell disposal – “No…

Marsh Wrens of Bear River Migratory Bird Refuge

This week I was finally able to get some decent images of Marsh Wrens. Canon 7D, 1/2000, f/8, ISO 400, 500 f/4, 1.4 tc In the past these birds have always been buried too deeply in vegetation for me to get shots I liked but a couple of days ago they finally cooperated with me. Canon 7D, 1/1600, f/8, ISO 400, 500 f/4, 1.4 tc Marsh Wrens have incredibly interesting behaviors. For example, western males must learn up to 200 different songs (eastern birds only learn about 50). Perhaps that’s why these males sing so much – it would take a lot of practice to learn that many “tunes”. Canon 7D, 1/1600, f/8, ISO 400, 500 f/4, 1.4 tc These birds are extremely territorial and aggressive. They are polygynous (males mate with multiple females) and in order to attract females the male builds from 6 to 22 “dummy” nests for every one that is actually used to raise a brood of chicks. We could see several of these nests buried in the cattails along the refuge road. Canon 7D, 1/2500, f/7.1, ISO 400, 500 f/4, 1.4 tc According to the Bear River Blog many of these nests were destroyed by our recent stormy weather and heavy rains so many of these males have had to start over. Canon 7D, 1/2000, f/8, ISO 400, 500 f/4, 1.4 tc Marsh Wrens of both sexes regularly destroy eggs and chicks of other birds near their territories, including those of…

American Kestrels – What They’ll Eat and What They Won’t.

I’ve always found it fascinating to watch these little falcons eat. A gruesome experience to be sure but so much more interesting than observing a raptor such as an owl who simply swallows its prey whole. And if you watch carefully there’s a whole lot more going on during the process than first meets the eye. Kestrels can be pretty picky eaters. I’ve documented in another post on this blog that they often refuse to eat the intestinal tract of their prey and deliberately discard it. Kestrels, like other raptors, eject pellets of indigestible materials like fur, feathers, chitin and bone. All food that is swallowed first goes to the crop. From there the usable food continues on to the stomach but the indigestibles stay in the crop, are formed into a pellet and regurgitated roughly 23 hours (in the case of kestrels) after the meal was consumed. Canon 7D, 1/800, f/7.1, ISO 640, 500mm f/4, 1.4 tc The kestrels I’ve watched eating voles and mice typically eat the brain, decapitate the rodent, then go for the soft internal protein rich muscles and other organs (discarding the intestines). Since kestrels tear their prey into bite-sized pieces they can pick and choose what they actually swallow. Canon 7D, 1/400, f/8, ISO 640, 500mm f/4, 1.4 tc Pellet expulsion can be difficult and traumatic as I’ve documented elsewhere on this blog with Northern Harriers and I suspect that’s one of the reasons that kestrels try to avoid swallowing as much fur as possible. When opening up the body cavity they often get a beak-full of…

Category: Behaviors