The Leos is a species released in 2019.
Appearance[]
URL: https://www.felisfire.com/feli?i=1012255 A gen 1 Leos featuring the markings: Badger, Cloak, Sleet, Frost, Gnosis,Belly, Belly Spots and Chin. Feli owned by Z (#7) and designed by Joelle (#5)
The Leos is a giant lion-like species with giant wings. Specimens have a feather crest on their heads and snout noses. They have feathers on their rears and also have feathers lining their tails.
They are currently the largest species on Felisfire.
The current art was done by Corv.
Due to being a recently released species, various markings do not yet work for them.
Encyclopedia Entry[]
Source: https://www.felisfire.com/encyclopedia_leos
History[]
The Leos is a species whose egg is featured on Eggdoku. 
Original concept art from 2012 pictured below:
Created by delve aka KnifeSmile(#1414)
The Leos was said to be an undead lion-wyvern species, cursed by the feli gods.
From News post August 12, 2017, 3:47 pm by Luna (then 5626). Has a leos with the markings Leopard moth (grey), Lionfish (magenta), Lizard (cyan), and Locket (red).
However, the concept was altered and updated in 2016 by the site's staff and a new concept was drawn by Luna(#5626).
The Leos was presumed to be released in 2017.