I wonder if the "need" to acquire desirable items is related to the male territorial urge? E.g. internally come to an understanding that Grass is Greener On The Other Side, formulate a rationalization and Acquire Said Grass. Repeat. Whereas the females of the species has more of a tendency to be happy with the pre-existing Grass and nest with it. The female of the species will rationalize this as Being Responsible With The Grass. Any secret machinations by the male of the species to modify, alter, or add to the Original Grass without permission of the female will result in a pissed off female?

Calvin :-D