What is it? #8

Snuffle, snuffle, what could it be? I can swim and climb, but you may not see me in the daytime as I'm well camouflaged. I have a tail and although I look quite cute I have been known to eat my own children! Right now I'm probably starting a nice, long and restful sleep .....zzzzzzzz
Just one thing..... I'm slowly disappearing from the countryside so come back on Sunday to find out what you can do to help me survive.