I'm not sure if that is the offcial name for the genre but it's close enough 

 

this genre inculdes games like:

 

zoo tycoon

Rollar coaster tycoon

railroad tycoon

mall tycoon

operation genesis

 

and I think some of the many "sim" games fit into here

 

 

the best has to be Operation Genesis the best park to ever build would of course be jurrasic park

http://www.gamingbliss.com/games/unsorted/jurassicparkoperationgenesis.jpg

http://www.selectmore.com/%5Cimages%5Cproducts%5Chires%5C200349_3.jpg

http://www.ezit.com.cn/pub/attachment/2003/12/267508.jpg

http://www.nlgaming.com/games/1437/xbox3.jpg

Can you let them out?

they can escape in some games and you have to catch them

Can you let them out?

 

yes that's the best part! you can let em escape and watch them devour the people with blood flying everywhere, the big dinos will shake the people's bodies around like a rag doll and the raptors will jump on them and tear chunks of meat out of the people  ;D

 

it's a cool game

I love operation genesis! that's one of my favorite games! watching the people getting eaten by dinosaurs is always fun