Neef's are omnivores, however the exact diet depends on where they live. For example, if a Neefur lives in the tropics, it's diet would be mainly fruits and berries, but if the species lives in a desert setting, a Neef would eat lizards and bugs.
Behavior
Behavior depends all on the personality of a Neef. Like a human, the species can have a grumpy attitude or a bubbly and happy attitude. It all depends on the traits of that specific Neefur.