What Animal Is It?

I'll start with descriptive hint as to what animal I'm thinking of. Then you guess it and write your own description to your animal. The next poster guesses that and so on and so forth.

• If you get it wrong, the person below corrects it and gets their animal hints as the creature to guess next.
  
• If your animal is guessed wrong, please give additional hints to aide the participants.
• If the guess post does not have an animal description with it, someone please post a description.
• Avoid Repeats
• Acceptable Animals are: Living, Extinct, and Mythological.

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This is that fastest animal via body lengths per second.

Tiger beetle??

I am neither beast nor bird.