In reply to petegunn:
When I lived in Ireland, I once went out for a walk in the Wicklow mountains and found lots of frogspawn that had been left high and dry on the footpaths when the weather had dried up a bit. I scooped some up in a Tupperware, took it back home, bought a small fish tank, and raised those little critters from spawn to froglet, before heading back to Wicklow and releasing them close to where I'd originally picked them up. I never got a word of thanks. Never again.