March 6 (UPI) --New research shows the "marginal value theorem" successfully predicts the movement of human hunter-gatherer camps like those of the Batek, an indigenous people living in the rainforest ...

As bumblebees forage for nectar, at a certain point, they will move to another area once their search for food becomes too inefficient -- a behavior, also observed among other animals, which conforms ...

Foraging creatures decide at some point that the food source they're working on is no richer than the rest of the patch and that it's time to move on and find something better. Researchers have now ...