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Q&A What modifications are needed for my sea creature to able to hold its breath for weeks?

Sperm whales can go 90 minutes at a time without needing to surface. I am interested in an idea for a creature that is air-breathing, but spends a lot of time at depths of (100m to 300m) and some...

5 answers  ·  posted 9y ago by Mikey‭  ·  last activity 9y ago by Mikey‭

Question biology water creature-design underwater sea sea-creatures