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But then on Dec. 22, 1938, Marjorie Courtenay-Latimer came across a strange blue fin poking out of a pile of fish that struck her as extraordinary. With its fleshy, lobed fins and its tough armored scales, the specimen looked very unlike fish we see in our oceans today. That is because the coelacanth has managed to survive in roughly its current form for hundreds of millions of years. In the course of researching this film, we learned all kinds of amazing facts about the coelacanth. For instance, unlike most fish, they give birth to live young. They produce eggs the size of grapefruits, which then hatch internally. From video footage taken by the explorer Hans Fricke - which we used as inspiration for our sets and puppets - we know coelacanths are prone to some odd behavior. They've been spotted doing headstands underwater.

By calling to their eggs, zebra finch parents may be helping their young prepare for a hotter world brought on by climate change.