The Function of Ocelli (false eyes) In Raptors
Some falcons, hawks and owls have two ocelli (eye-like patches or “false eyes”) on the back of their head. Their function may not be as presumed.
Tag: mobbing
Great Horned Owl Framed By Tamarisk
Typically when I find a Great Horned Owl in a natural setting it’s so deeply buried in the tree or foliage that it can barely be seen. This is a deliberate behavior, at least in part to avoid mobbing birds of many species. Crows, for example, will invariably mob an exposed GHO, pursuing it from tree to tree and calling out to other crows to recruit them to join in. 1/800, f/8, ISO 500, 500 f/4, 1.4 tc, natural light, not baited, set up or called in This owl, and one other, perched in the tamarisk for about a week but on most days they were virtually impossible to see unless you knew where to look. But on two cold, early mornings I found one of them in this spot where it was exposed to the warming rays of the sun. Its breast and belly feathers are wet, as are the drooping ear tufts. These birds sleep during much of the day but their slumber is light and alert as evidenced by their ear tuft (“horn”) movements in response to any slight sound, even with eyes closed – a behavior that’s interesting to observe if you’re lucky enough to be sufficiently close to a sleeping owl. Ron
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,…
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Great Horned Owl Framed By Tamarisk
Typically when I find a Great Horned Owl in a natural setting it’s so deeply buried in the tree or foliage that it can barely be seen. This is a deliberate behavior, at least in part to avoid mobbing birds of many species. Crows, for example, will invariably mob an exposed GHO, pursuing it from tree to tree and calling out to other crows to recruit them to join in. 1/800, f/8, ISO 500, 500 f/4, 1.4 tc, natural light, not baited, set up or called in This owl, and one other, perched in the tamarisk for about a week but on most days they were virtually impossible to see unless you knew where to look. But on two cold, early mornings I found one of them in this spot where it was exposed to the warming rays of the sun. Its breast and belly feathers are wet, as are the drooping ear tufts. These birds sleep during much of the day but their slumber is light and alert as evidenced by their ear tuft (“horn”) movements in response to any slight sound, even with eyes closed – a behavior that’s interesting to observe if you’re lucky enough to be sufficiently close to a sleeping owl. Ron
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,…