What do Yellowjackets possess that allows them to survive winter?

Yellowjackets possess an antifreeze compound in their blood, which enables them to survive the cold temperatures of winter. This antifreeze-like substance helps to prevent ice crystals from forming in their bodily fluids, effectively reducing the risk of cellular damage during freezing conditions. As a result, Yellowjackets can endure the winter months by entering a dormant state, though it is important to note that this is typically true for the queen Yellowjackets. While the workers die off, the queen can survive until spring, when she will emerge to start a new colony.

The adaptation of having antifreeze compounds is crucial for their survival, especially given that Yellowjackets are not adequately equipped to handle freezing temperatures in other ways. Other strategies, such as burrowing or having a thick layer of fur, are not characteristic of Yellowjackets, and they do not have a unique hibernation process similar to some other insects or animals that truly hibernate. This specialized adaptation to harsh conditions is what distinguishes Yellowjackets in their ability to endure winter.