When his sister is taken, a rule-loving fiddler crab breaks out of his shell and dives claw first into a global climate crisis to save her.

Thanks for your reply. Bisque made me chuckle! All good points to consider.

A crab story, nice.

Bisque for thought 😉
Crabs migrating in and out of the water could answer how the protag-crab’s sister came up missing?
What if a climatologist took the sister crab to study?
Is he an Ordinary crab, like Emmet’s character from The Lego Movie?
We go from a close nit crab-commune to a global climate crisis – can the crab’s endangered habitat bring this closer to home?

This is your story, and I’m out of crap puns 😉 - keep going!

Thanks for your thoughts! Great stuff.