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The owl's remains date back to the Miocene-Pliocene boundary 5.5 to 5 million years ago. The fossil bones are about 60% as long again as a modern barn owl, [1] giving a total length of about 50–65 cm for T. robusta. This owl provides an interesting case study of evolution and insular gigantism.
The bird family Tytonidae, which includes the barn owls Tyto and the bay owls Phodilus, is one of the two families of owls, the other being the true owls or typical owls, Strigidae. They are medium to large owls with large heads and characteristic heart-shaped faces.
A number of owl fossils were at one time assigned to the present genus, but are nowadays placed elsewhere. While there are clear differences in osteology between typical owls and barn owls, there has been parallel evolution to some degree and thus isolated fossil bones cannot necessarily be assigned to either family without thorough study.
Red owl: Tyto soumagnei (Grandidier, A, 1878) 10 Western barn owl: Tyto alba (Scopoli, 1769) 11 American barn owl: Tyto furcata (Temminck, 1827) 12 Eastern barn owl: Tyto javanica (Gmelin, JF, 1788) 13 Andaman masked owl: Tyto deroepstorffi (Hume, 1875) 14 Ashy-faced owl: Tyto glaucops (Kaup, 1852) 15 African grass owl: Tyto capensis (Smith, A ...
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 ...
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