Are owls vertebrates

Yes, an owl is a bird with an internal skeleton and a backbone consistant with the vertebrate classification.
Yes, an owl is a bird and birds are one of the 5 big groups of animals that have a backbone & skull. The 5 big groups of vertebrates: fish, amphibians, reptiles, birds, and mammals. For an illustration of an owl skeleton, visit the owlpages at http://www.owlpages.com/image.php?image=articles-Owl+Physiology-Skeleton-01 .