I fed San Francisco Bay Brand blood worms/ mosquito larva today everyone seemed to like it. I mushed them up a bit so they could rip at the blood worms.
I'd really like to cultivate my own earth worms and dehydrate them and start using it for my supplemental protein source. Maybe experiment with meal worms and wax worms.
I think in nature they occasionally come across dead fish, amphibians, snails, shrimp, insects, worms as part of there natural diet.
The key to anything in life is balance.