There is an average of 18 grams of protein in 100 grams of crab. Grasshoppers are a bit easier to catch and have over 20 grams of protein per 100 grams of weight.
Hunting crabs is pretty easy too. It's certainly safer and uses less energy than hunting bigger animals.
BTW, I found this claw. I didn't kill a crab for this pic.
|Freshwater crab claw|