Slimy yet satisfying. I'm supposed to camp with a friend of mine from south Louisiana this weekend. His theory is that they are very plentiful, and that they require a minimum of energy expenditure to catch. In a prolonged low light long-term survival situations, grubs, fungus et.al., might be a food solution. Photosynthesis will be zip, but you will have a plenty of decaying plant matter.
Mammals have parasites that can live in other mammals.
Malaria, in mosquitoes. Bubonic plague in fleas. Lyme's disease in ticks. And fleas can also carry lice, which have their own set of parasites, which can call humans home. This reminds me of something I saw on PBS in a discussion of scanning electron microscope photography.