Argentavis magnificens, a species of teratornithid bird from Miocene Argentina. With an estimated wingspan between 5.5 and 6.5 m. this was one of the largest birds ever. It stood about 1.5 m. tall.

Tumblr Artist, PaleoArt, Creates Beautiful Animal Evolution Series (22 Species) - World's largest collection of cat memes and other animals

Beautiful blue feathers imagined on the Xiaotingia zhengi.

above: a variety of bird lineages which can be found upon Serina 100 million years post-establishment. ~~~ 100 million years have passed since the first... Birds of Serina 100 Million Years Hence

“Sinosauropteryx is one dinosaur I have reconstructed several times through the years. Top left (and accompanying sketches) was done for Nat Geo Mag. 3rd one was for my licensing library and the 4th one (a more stylized juv.) for the book ‘Dinosaurios Bebés” #paleoart #sciart”