The Skorr are bipedal avians with lifespans spanning hundreds of years. They are feathered and stand from two to three meters tall. There body is much like that of a winged humanoids with bird legs and head.
They have developed a space faring civilisation and have long existed as a warrior monarchic culture with advanced technology and the ability to breed vast armies very quickly until the mid-21st century, when the philosopher Alar lead his race into a new era of peace. After Alar's death, his thought patterns were preserved in an indurite sculpture referred to as the "Soul of Skorr."
Source: Star Trek: The Animated Series: “Yesteryear”, ‘The Jihad”