Landfills are wildlife habitat. They are full of "garbage bears", crows, ravens, shithawks, eagles, rats etc.
Sort of like how the Chernobyl dead zone is now a major wildlife refuge (and home to the unique Mus chernobylensis, a species of field mouse that experienced 1 million years of genetic drift in 20 years due to the radiation and is now a separate species no longer fertile with regular field mice) and the parets of Cambodia and Vietnam where there are too much mines and shrapnel for people to farm or cut trees down, are also wildlife sanctuaries.