On this episode of Animal Fact Files discover some birds with big hearts and even bigger voices.<br><br>You can learn more on:<br>Twitter - <a href="https://twitter.com/animalfactfiles" rel=nofollow target=_blank>https://twitter.com/animalfactfiles</a><br>Facebook - <a href="https://facebook.com/animalfactfiles" rel=nofollow target=_blank>https://facebook.com/animalfactfiles</a>
