Hognoses can thrive off of a diet of exclusively mice. I have two Eastern hognoses that will readily accept frozen minnows and I will supplement them occasionally. But to survive entirely off of a diet of fish and insects, I am sure that most people will agree is not the ideal situation. Ironically, if you are going to have a debate about the captive feeding of any snake, hognoses would certainly be at the top of the list. Although no one can conclusively say one way or the other, the information we do have tells us that rodents are a complete diet for the vast majority of pet snakes. If for some reason you have a problem with using mice (they don't have to be, nor should they be alive when you feed them to the snake), perhaps a garter snake would fit your needs best.
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...the oldest task in human history: to live on a piece of land without spoiling it."
Aldo Leopold (1938)

"Sometimes I think the surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us."
Calvin and Hobbes (Scientific Progress Goes 'Boink', 1991)

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