Tangential: where are all the dead animals? There are plenty of animals around, even in an urban area, such as birds. But, I never recall running across dead

Tangential: where are all the dead animals? There are plenty of animals around, even in an urban area, such as birds. But, I never recall running across dead animals, except road kill, or the dead mice and birds our cat would bring us. Is there an animal cemetery somewhere they go to bury themselves?