 of this thing called migration it's what birds will do all across the nation they go north to south and come back again but what you don't realize is the beavers are their friends they spend all their time hollowing out the trees so that the birds can make nests easily luckily a president theodore roosevelt thought he had to do something really heartfelt so he made reservations to uphold conservation to help with migration all over the nation these refuges have worked so hard to establish can only function if man and animals work together come on puddles let's lend a hand to make this beautiful spot a nice resting place for our migratory friends all right teddy migration you've got the campus back in the northern pinter with the buffalo head and the long-haired fowls jimmy swift is out on the drift while the blackbilled cuckoo may grow they're all hairy with pecker and belt-ticking fissures with the bay wiped out and all the parts go the cedar wet swing is doing his thing but the piper creeping they sink fly