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Cross sectioned great grey owl specimen showing the extent of the body plumage, Zoological Museum, Copenhagen Skeleton of a Strigidae owl. While typical owls (hereafter referred to simply as owls) vary greatly in size, with the smallest species, the elf owl, being a hundredth the size of the largest, the Eurasian eagle-owl and Blakiston's fish owl, owls generally share an extremely similar ...
With only a handful of species surviving today, the Nautiloids flourished during the early Paleozoic era, from the Late Cambrian, where they constituted the main predatory animals. [71] Haikouichthys, a jawless fish, is popularized as one of the earliest fishes and probably a basal chordate or a basal craniate. [72]
A = Anapsid, B = Synapsid, C = Diapsid. It was traditionally assumed that first reptiles were anapsids, having a solid skull with holes only for the nose, eyes, spinal cord, etc.; [10] the discoveries of synapsid-like openings in the skull roof of the skulls of several members of Parareptilia, including lanthanosuchoids, millerettids, bolosaurids, some nycteroleterids, some procolophonoids and ...
The largest owls are two similarly sized eagle owls; the Eurasian eagle-owl (Bubo bubo) and Blakiston's fish owl (Bubo blakistoni). The largest females of these species are 71 cm (28 in) long, have a 190 cm (75 in) wing span, and weigh 4.2 kg ( 9 + 1 ⁄ 4 lb).
Since first appearing during the age of dinosaurs, snakes have authored an evolutionary success story - slithering into almost every habitat on Earth, from oceans to tree tops. Scientists ...
Anoles on a given island evolve into multiple body types and ecological preferences, and the same set of body types appears in unrelated species across distant islands. [93] The Asian sea snake Hydrophis schistosus (beaked sea snake) looks just like the Australian sea snake Hydrophis zweifeli, but in fact is not related. [94]
Two birds studied in the Parque Nacional de La Macarena of Colombia were free of blood parasites. [19] Burrowing owls often nest and roost in the burrows made by ground squirrels, a strategy also used by rattlesnakes. [18] When threatened, the owl retreats to the burrow and produces rattling and hissing sounds similar to those of a rattlesnake.
During surveys in 2016-2019 on Kunashir Island, 28 pairs of Blakiston's fish owls were registered. [38] In Russia, fish owls are killed by fur-trappers, drown in nets set for salmon, and are shot by hunters. [23] In Japan, death by hunting is unlikely, but fish owls have been hit by cars and killed by power lines. [33]