Ryan Reynolds is putting the spotlight on animals that get ahead using sneaky tactics, like this cowbird. In a classic 'cuckoo' moment of brood parasitism, the cowbird has laid its egg in the nest of some warblers who will raise the chick as their own. Watch Underdogs, narrated by Ryan Reynolds, on Wednesdays at 9pm on National Geographic WILD UK. Also streaming on @disneyplusuk | National Geographic UK