I was re-watching WWW and decided I'll post this screencap here, if you haven't already gotten it
I've never noticed the "baby bird" or "baby tiger" before. I'll keep a lookout the next time I re-watch the episodes.
On a completely unrelated note, the Cat Friend in Bloo's the Boss was reused from Adoptcalypse; it was one of the random Friends in the background. XD