Forty Years ago Rainbow Connection by Kirmit the Frog was on the charts. What other songs had animals as vocalists in the song? The animal doesn’t need to be the main singer, so songs like Disco Duck would count.
By the way… Adam Ant, the Eagles and so forth don’t count - they are humans.
Too many cartoon-critter songs exist; they should not be counted. Real animals are needed. Parrots, probably, or those keyboard devices that pinched the tails of trapped cats. Or JINGLE BELLS sung by sampled dogs.
On the intro to MR BOJANGLES, Teddy the dog sings a bit of OLD RUGGED CROSS. Sort of.
Jon Williamson had an Australian hit with Old Man Emu:
*Let me tell you of an interview with an Old Man Emu
He’s got a beak and feathers and things
But the poor old fella ain’t got no wings
Aren’t you jealous of the wedge-tailed eagle
While the eagle’s flyin’ round and round I keep my two feet firmly on the ground
Now I can’t fly but I’m tellin’ you, I can run the pants off a kangaroo*