Here are some fun websites for you to explore with your child which focus on animals in winter.
Hibernation games, movies and activities at BrainPOP Jr.: http://www.brainpopjr.com/science/animals/hibernation/
Winter games, movies and activities at BrainPOP Jr.: http://www.brainpopjr.com/science/weather/winter/
Migration Family Activities: http://www.brainpopjr.com/science/animals/migration/grownups.weml#parents
Series of links about Hibernation and Migration: http://www.saskschools.ca/~gregory/winter/win2.html
Beautiful video on Migration from YouTube: http://www.youtube.com/watch?v=Q40h8dPmgwQ