This is the first time I've heard something like this I had no idea animals could be left handed too! We used to have two budgies at home, but I never paid attention to which foot they preferred. Now I'm honestly tempted to go watch a bunch of parrot videos just to see if this leftie thing shows up elsewhere too.
My cat is left-pawed: her first swipe at something is always with her left front paw.
Most cats are left pawed.
Update: see comment below. Studies are not conclusive.
Most animals are lefties. We are the odd ones.
Fiddler crabs have one large claw and one small one. Usually which is bigger (right or left) is distributed 50/50. But there is one species - an Australian one - where only 1.4% are left-clawed.
A crab finding itself left-clawed means they fight differently and are generally less successful in fights, thus they live a more asocial life by choice and necessity. https://en.wikipedia.org/wiki/Gelasimus_vomeris