[quote=@idlehands]
Not to mention those jungle floors don't get a lot of sunlight. 
[/quote]

Right.

Essentially it's just sort of an alien ecosystem. Normally feeders come to the food and eat; some places, it's more efficient for the feeders to wait and the food comes to them. Deep ocean fish do it too; we sorta write it off because hey, they're fish, doesn't count, but it's the same principle in a similarly harsh environment.