If I recall correctly the fastest object ever was a manhole cover after an explosion. If it was sentient then it would be the fastest creature.
BRB, going to look up the incedent.
Edit: Here you go
Every physicist I met was in some way unhinged. One had delusions of grandeur, second couldn’t bare his feet in any circumstances, another one would pause lecture every ten minutes to go into his room from which indescribable sounds would come.
It’s probably the unbearable awareness of vastness of space that does a number on you. I wonder if they have any pills for that
Dried frog pills, probably. I've been told if you take one you can hallucinate that you're sane, which is probably close enough for the average physicist.
If there were alien life, would this change the answer? since the question is “animal” and the kingdom of animals is a taxonomic classification of stuff on earth, I would assume the answer still remains the same