I'm The Biggest Thing In The Ocean by Kevin Sherry

This is about a giant squid who goes around the ocean showing us how he's bigger than everything, and you can tell he's really proud of this fact, in a fun way. Then a whale comes behind him and eats him in all of his glory and he's shocked for a second. But then he looks around at all of the other animals in the whale and then proclaims happily that he's the biggest thing in the whale.

 It's an optimistic book about a squid who happy with who he is enough to see how he's great no matter the situation. It's short, but it's good to read out loud and has bright, colourful pictures.