first off- the only real world animals in skyrim should be....
wolves
bears
dogs
boars
falcons/hawks/kites/eagles
tiny birds like sparrows
small fish
crabs
rats
deer
rabbits
should we have squirrels?
should we have platypus?
should we have buffalo?
mythical animals should include...
water...
slaughterfish
seals with arms (more underwater variety)
mudcrabs
some other forms of crustacian (nothing very large)
dreugh (water variety only)
strange whales (throw some extra fins on it?)
strange sharks
strange squid (perhaps the tentacles could come out both the top and the bottom of the creature)
epic turtles :turtle: they could be made epic with antennae (like ants). can you imagine turtles with antennae?
land....
dinosaur sheep
snow leopard like beasts that are very wide and may or may not have faces like bulldogs
something that fights like a scorpion but is in fact- not a scorpion
something that has the rough shape of the half life 2 (ep2) hunter ( http://i.ytimg.com/vi/eDqhw04BjWc/hqdefault.jpg )
something similar to a headcrab (ever played half life? well you should have- what kind of hardcoe gamer are you)
its hard to think of land animals without going over the top, please expand this bit
air.....
(if akaviri invades) wyverns http://t0.gstatic.com/images?q=tbn:dbNEIitET3xUqM:http://2.bp.blogspot.com/_r_nuiF06sA8/RphR8CWPtWI/AAAAAAAAAUg/fvZMxi74SQ0/s1600/Wyvern_400.jpg&t=1 or http://images.wikia.com/monsterhunter/images/6/68/Rathian.png (if no akaviri then it probably wouldent fit)
cliff racers, although very different to morrowind in behaviour
behaviour
animals, should be as dynamic as people in this game, they should hunt,feed, fight each other.
- predator animals should only attack when hungry
- animals should either fight or run when threatened
- most predator animals should pick the easiest target
- some animals should move in groups, others should go solo
- animals should eat what they kill/find
- some animals can call for help. but no psychic ability's ok.
- some animals should sleep at different times
- animals should be afraid of some things
- animals should be protective of their young
- animals may have burrows
-aggressive and hungry animals in the sky should often not be able to spot the player, especially when the player is in thick cover such as trees)
firstly, monsters should not be wandering around outside anywhere near as much as oblivion. natural wildlife however do
animals should scale nowhere near as much as oblivion. weak players should be encouraged to stay by roads or not travel so much at dusk/dawn/ night depending on the area.
animals such as wolves that overwelm the player or strong animals like some of the ones i made up should give of warnings like an aggressive howl in the distance followed by epic music that tells the player to run like [censored] (this should wake you up sometimes when you sleep in the woods)
(and to combat going outside of the border, rather than the invisible walls we all hate- a very large amount of animals may come for you)