Who is our friend?

Can you guess who our best friend is? He’s not like us at all.
Our friend is a Bird!
I am Rhino. I get covered in fleas.
Bird eats them all up.
I am Crocodile. I can’t brush my teeth.
Bird pecks them all clean.
I am Giraffe. I can’t scratch my head.
Bird can reach just the right spot.
I am Zebra. I can’t see things far away.
Bird has great eyes, so when he’s watching I’m safe.
Bird might be different, but that’s no problem…
We don’t even mind when he sings!

Who is our friend?