based on real animals. the kracken, the giant squid is actually an animal that exists. mermaids were based on manatees and things like that. martha: wait a minute. mermaids don't really exist, right? >> no. despite what you might see on certain television shows. martha: television shows, my children were convinced. wait a minute. it has to be. i saw it on a science show. >> we call those mocumentaries. my job at national wildlife federation is get people excited about nature and teach them about it and sometimes the truth is stranger than fiction, right? these are animals that really exist that we know so little about. when you think about the fact that the oceans are under assault, we're massively overfishing them, there is awful pollution, climate change is affecting ocean, depleting water even faster than the air, for species like this we don't even know what their populations are because they're so rare and so