After you beat the game, how do you check your vivosaurs' status?

Touch the small yellow icon in the lower right corner of the screen. It should bring up your status. On the bottom left of that screen, you should see 4small icons, the last of which is a silhouette of a dino. Touch that and you'll bring up a screen that shows your current team on the top and your collection on the bottom. In between, find the word "fossilary"; touch that and all the dinos you've found so far will show up. Go to the vivosaur you want to check and on the bottom of that screen there's a small white box. Touch that and it will give you all the stats on that particular vivosaur including diet and era. If you look at the bottom of the fossilary screen, there are several buttons that allow you to rearrange your collection by name, number, etc. One of those is era, so if you're looking to assemble an all Cretaceous or all Jurassic team, that makes it easier. Hope this helps.