Is yawning exclusive to mammals?

I’ve seen your parrot doing other things…
http://www.anapsid.org/sneeze.html

http://en.wikipedia.org/wiki/Yawn#Non-human_yawning

Funny. I handle my bird all the time (no, that’s not a euphemism) and I’ve never seen him do it.

My parrots definitely yawn (I can induce a yawn by petting them around their ear hole). My fish do something that looks like yawning…..if I had to guess, I’d call it a yawn.

@AstroChuck It’s possible that your, uh, “bird” might not yawn. It seems to be very common amongst mammals, but differently pronounced in birds and fish.

I have budgies and a cockatiel and have never seen anything that resembled a yawn. But as you pointed out, birds aren’t mammals. My dogs yawn loudly and yawns are contagious. We have a yawn festival morning and night:). I’ll trust your experience with reptiles as I don’t have any. I respect their right to be ~ away from me!

I had Koi and I could swear they would yawn once in a while.

@Dracool- I have no experience with mammals either. I especially dislike snakes.

My parrot yawns. Case closed. :-)

My cockatoo can be induced to yawn by scratching near her earhole, as @syz said.

My pet amoeba yawns.

I think that little Geico guy yawns.

also, why is yawning spontaneously contagious?

@mammal http://www.yourdiscovery.com/video/mythbusters-top-10-is-yawning-contagious/

@Dog Would that be a coy yawn?

@Dracool- I need to edit that. I meant I don’t have experience with reptiles either. I have plenty of experience having mammal pets.
Damn. I’ve been screwing up a lot more lately.

@AstroChuck You’ve never recovered since the “man ‘n cheese” episode!

@janbb- You may be onto something.

Yawning occurs in reptiles, sharks and reptiles as well as mammals.

What about in the world of insects and spiders?