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The science of inland waters, posts on Biology SE should focus on the biological aspects of this discipline.
4
votes
Accepted
Which animal dug this 5 cm diameter hole deep into mud and build a large mound around it?
A crustacean (land crayfish). There are a lot to choose from.
http://web.nchu.edu.tw/~htshih/crab_fw/fw-crabe.htm
2
votes
What terrestrial trait makes cetaceans so successful in an aquatic lifestyle?
Advantages of air breathing over gills? Keeping in mind water-breathing animals could still evolve lungs.
Not being vulnerable to parasites and diseases of the gills, which are obliged to have blood s …