Photo: White-breasted Nuthatch hunkers down on a branch

1102 of 1631

A White-breasted Nuthatch (Sitta carolinensis) looks pretty adorable all puffed up. Many birds use this technique to trap body heat, and also cover up more of their legs to stay warm.

Would you like to see your nature photo featured on TreeHugger? Join the TreeHugger Reader Photo Pool on Flickr and add your pictures to the group!

1102 of 1631

More Slideshows