respect to distance from their central place and, to a certain extent, to variations in tree species. We also learned that foraging behaviors and food selection is not always straightforward. For instance, beavers selected large branches at any distance from the water even though cutting large branches may increase energy requirements. There seems to be a fine line between energy intake and energy expenditure in beavers that is not so easily predicted by any given theory.
References
不多说-。-
随便一种通用格式就可以了。