In evolution, it’s usually thought that organisms avoid competition through resource partitioning, which allows a greater diversity of organisms than otherwise possible. For instance, if two birds live in the same tree and eat the same types of insects, one bird may specialize in the top of the tree while the other specializes in the bottom of the tree. This works with plants as well as animals and other organisms.  In a new report from Okayama University,  researchers suggest that resource partitioning is not always necessary...