I can confirm that creatures can 'fly', but not be permanently airborne.
When you jump and have wings, the jump button (space bar) turns into a 'glide' button which flaps your wings. Higher level glide = the ability to fly further. I found with Glide 4 I was able to fly completely over trees and hostile creatures in creature mode, and in tribal mode my creatures would use a combination of running/flying to travel around.
Domesticated creatures (in tribal) come and live next to your village, and lay eggs which you can harvest for food. Not rideable, unfortunately.
When you jump and have wings, the jump button (space bar) turns into a 'glide' button which flaps your wings. Higher level glide = the ability to fly further. I found with Glide 4 I was able to fly completely over trees and hostile creatures in creature mode, and in tribal mode my creatures would use a combination of running/flying to travel around.
Domesticated creatures (in tribal) come and live next to your village, and lay eggs which you can harvest for food. Not rideable, unfortunately.