adding some life

How can one go about about adding some living things to scenery? I have some Louisiana scenery with cows in it; how are they created and then made usable by FS2002? Can an object be created in basically any 3D program and somehow imported? Are there only certain 3D formats that are usable?
Could something like this be animated as well? I'd love to add some sea going creatures to the oceans. It would awesome to have, for example, a whale that occasionally surfaces just off a coast line.
I see lots of programs for scenery related tasks but nothing seems clear about their actual functions.
I know next to nothing about making scenery of any kind so maybe this is really absurd. Please pardon my ignorance if this truly a laughable idea.
Could something like this be animated as well? I'd love to add some sea going creatures to the oceans. It would awesome to have, for example, a whale that occasionally surfaces just off a coast line.
I see lots of programs for scenery related tasks but nothing seems clear about their actual functions.
I know next to nothing about making scenery of any kind so maybe this is really absurd. Please pardon my ignorance if this truly a laughable idea.