He's an active boy - his origins leave him rather hyperactive and very light on his feet. He's got an early aptitude for gymnastics. Unfortunately, he's also got rather light bones, so he's more prone to injury. It's doubtful he'll break things with his own movements, but if he ever gets into a fight ...
Well, he'd better try not to get hit too hard!
He doesn't actually have any body hair; instead, he has patches of feathers where he should. We're not saying where all he actually has these downy puffs - except for on top of his head and, well, the obvious tail! At the moment he has to wear his pants a bit high to accomodate the tail puffs, but perhaps when he's older the lab will have something better fitting.
While he's no Spider-Man, Enna does have an exceptional grip. He can hold onto the slightest of ridges and climbs easily. Unfortunately, so far his metabolism leaves his stamina a bit lacking. He eats at least twice as much as most other boys of his size, and he has an increased heart-rate to match his frog-and-bird origins. It makes him live a little faster than everyone around him - not necessarily aging, but in the way he moves and (probably) his patience level, eventually.
On the polar, if you'll forgive the pun, opposite of Polar-Worm, Frog-Bird here can't stand the cold. Temperatures below 60 F run the risk of setting him into hypothermia if he's not bundled in cloth. He can stand temperatures in the 130+ range with no ill effect, however. As such, the current Labs temperature is set at 65 F, to accommodate both him and his chilly tube-batch-mate.
An interesting note is that he has no sclera. His entire eye is stark red, except for the pupil.