vegetation

Why are some hoofstock, rhino, hippo, and elephant paddocks so barren http://www.zoochat.com/39/elephant-odyssey-asian-elephant-exhibit-near-115805/, while other paddocks are kept lush with vegetation (mainly grass in this case) http://www.zoochat.com/590/7-acre-african-elephant-exhibit-179167/...

The lion enclosure in Copenhagen Zoo. Though it's not the biggest enclosure you could think of, the lions still have a fair amount of space here. There is also quite a bit of natural vegetation in here. The lions here are african lions. Taken in Copenhagen Zoo, 2006.