PikaPhoto: Kimon BerlinIs the pika America’s cutest rodent lagomorph? Think fast about that one, because global warming is herding it towards extinction. A recent study published in Global Change Biology found almost a fivefold increase in the local extinction rate of pikas. We’ve put together a slideshow, so you can get your fill of their cuddly little faces before it’s too late. (You can also get a free, annoying pika squeak ringtone for your phone, if you’re worried about their calls disappearing from our mountainsides.)