There's an endangered little critter - the desert pupfish - that has successfully invaded some man-made ponds.
The artificial ponds were designed for scientific research - of something else completely.
Apparently the fish swam a mile and a half through a pipe.
The fish were in a declining niche,
"Our lives are at risk!" they started to gripe.
Some of them got the traveling itch,
And swam through over a mile of pipe
To man-made ponds of a suitable type.
Once there, they happily swam about.
"This is way better than the old ditch
Where we used to hang out!"
They were heard to shout.