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There is "crayfish" but it is all one word.

I presume it's just a reference to crayfish, ChrisE

Sorry, Claudie. The other one is "pharaoh's rat"

I have river for 5 down but cannot see how it works.
Stream first and last in 24. 5 letters. 24 being poser, the answer to ...very big but not extravagant question
Thanks for any suggestions.

Poser

First - Po (River)
Last - R (River abb in crosswords)

Thank you.