I've been thinking and came up a theory.
As far as we know, all souls who does not go to SS will end up as Hollows, correct?
Well, if there is human-soul Hollows, wouldn't it be obvious that souls of animals would become Hollows as well?
And if they could possibly become Arrancars, would they gain a zanpakutō of their own?
well it was a boy soul inside the cockatiel. and that kid went to soul society they met him up there.
komamura im guessing has more story behind his appearence. probably something involving Genryuusai.
cause komamura has shown that he owes the old man something. so im not sure you can class him as an animal.
and yoruichi is yoruichi. that was like a henge but in bleach.
and honestly im having trouble seeing animals becoming hollows... but it could happen i suppose.
You know, if a soul of a powerful extinct animal, for example a T-Rex, becomes a Hollow, would they be quite fearsome if it were a Vasto Lorde before becoming a Arrancar? Since they have been dead for quite a LONG time, then they have enough time to evolve into Vasto Lordes than humans.
Well, the Genryusai-komamura thing is probably only that he accepted Komamura despite his appearance so he no longer had to live as an outcast. I doubt animals have souls, have we ever seen an animal in SS?
Could be that animal souls are reincarnated into other animals. Which is possible since the animal population is decreasing in the world atm IMO. Apart from the KFC chickens which have no souls to being with :P
I don't think there are really any animal hollows. Animals are more based on instinct than anything else really so they may just naturally go to SS or wherever dead animals go on their own. /shrug
Urazz: Hey sis what's going on? Urazz's Sister: I cut myself. Urazz: Take it like a man even if your a woman. Urazz's Sister: Ok!
*Urazz's Sister kicks Urazz in the groin.* Urazz: $%^&%(# Urazz's Sister: I dunno. I'm sure it's much better to take it like a woman. That was evidence to support my theory.
*Urazz whimpers like a baby*