Ibero-mesornis - sparrow-sized fossil bird of the Cretaceous period of time having a vestigial tail; found in Spain; viewed as probably the third most primitive of all birds Roosters can generally be differentiated from hens by their striking plumage, marked by lengthy flowing tails and vibrant pointed feathers on https://fancychickens51885.total-blog.com/about-chicks-51715512