Oh geez...I can't wait to be a Pterosaur and fly through the skies. WOO! I have a suggestion for the flying/controlling an animal mechanism: arrow keys to move, Spacebar for flying/jumping, and maybe hit a preset button on the keyboard to switch between walking/running/fast or slow flying, depending upon the animal you are controlling at the moment.
Erm...I did sort of get the ideas of controls from Spore...but those controls are REALLY convenient for me. It's hard for me to move an animal with just the mouse, or having to use multiple key combos.
If there are to be day/night cycles, I'd also suggest slowing down the rate of day/night, and slow down the clouds a bit. I'm a bit of a nitpicker in that respect. Either that, or make the day/night cycles, cloud speed able to be set by the user(1x, 2x, 3x, speed, etc., with 1x being the slowest, and any x's beyond being faster speeds).
If none of this is possible and/or already set in stone, just ignore me.

I need to go brush up on my Cretaceous-period dinosaur knowledge..I LOVED dinosaurs as a kid, still do, but it's been ages since I've done any research.