Hello I'm Dr. Christine Portfors. I'm an associate professor in the school of biological sciences at Washington State University, Vancouver. And today we're here to talk about what do bats do in the winter. Well it depends on what type of bat you're talking about. Some bats, like the ones that live in temperate areas, they hibernate and what hibernation means is that they find a place where they go and basically sleep for all of winter. So hibernation sites can be in caves, they can be in abandoned mines. Some bat species will actually hibernate under leaf litter which doesn't seem like the most safe place but they seem to do OK. And the reason why bats hibernate in colder climate is because their food source goes away. So most of those bats are eating insects and in the wintertime as most of you know, there's no mosquitoes, there's no moths, there's no beetles and so there's no food for the bats. Now some other bat species migrate which means that they move from a colder area to a warmer area. It's just like many of us like to do in the wintertime if we live in a cold climate, we like to go south for the winter where it's warm and sunny. Now bat species that live in warm climates, they don't do anything, they just maintain their regular activities because their food source is still there and wintertime for them might mean a little bit more rain but for some species it might actually mean more food. So what a bat does in the wintertime is very dependent on where it lives and what species it is.