Yes I like the biology 101 lecture...
But 4 winged flyers were actually six limbed...like the other evolved creatures on the planet except the Na'vi...
4 limbs for flying, and then legs...
wolves have 4 limbs, whales have four limbs, the others are vestigal now or part of their tails...
INSECTS...have multiple limbs...
Mammels do not. on Earth....
there have been countless sci fi / Nat Geo biology shows showing what evolution on other planets may be like..
I think the biggest failure here in this movie is the greatness of multilimbed creatures, and the wonderful variety of wild life showing.. and then you have giant blue skinned., 4 limbed smurf/elves...
Why couldn't James Cameron have gotten the bright idea to have co-hesiveness in his creatures to his intelligent, gorgeous Na'vi??
THat is a failure. I like my movies to have cohesiveness...its jarring to some sense in the brain.
It is a wonderful movie, great special effects, great creature creations... but lack of a good story, plot holes the size of the moon, and non cohesion, make my brain go OOOOOKKKK.
Are you really arguing about how realistically Cameron's made up creatures evolved in a sci-fi movie? I think sometimes you have to sit back and just enjoy a movie and not try to pick apart every small detail.