Why do invertebrates die in winter?

There is no doubt that winter is a difficult time if you are an invertebrate. Not only does the cold slow them down, making them easier prey for hungry birds, but temperatures below freezing can kill them. The problems faced by invertebrates in winter can be divided into two categories: food and cold weather. Most trees and shrubs lose their leaves in winter, and there is almost no sap in the branches. This means that herbivorous insects (insects that feed on plants) must find a way to live without food for several months. To do this, they enter an inactive state, such as deep sleep, with all of their metabolic processes slowing down. One way to avoid cold weather is to move to a warmer climate and return after winter.