托福口语 Task 3

In biology, the concept of 'behavioral adaptation' refers to an action or series of actions that an organism performs to survive in its environment. Unlike physical adaptations, which are structural features, behavioral adaptations are learned or instinctive responses that increase an organism's chances of survival and reproduction. These behaviors can include migration, hibernation, hunting strategies, or social cooperation. They arise through natural selection, as individuals with advantageous behaviors are more likely to pass on their genes.

Professor: So, let me give you an example from a study on a type of bird called the acorn woodpecker. These birds live in groups, and they have a fascinating behavioral adaptation related to food storage. Instead of each bird storing acorns individually, they work together to create a 'granary tree'—a dead tree or large branch where they drill hundreds of small holes. Then, they each collect acorns and wedge them into these holes. This cooperative behavior ensures that the whole group has a reliable food supply during winter when acorns are scarce. If they acted alone, they might not find enough storage space, and some birds would starve. By working as a team, they increase the survival chances of the entire group, which is a clear example of a behavioral adaptation.