Yes they should receive the death penalty They indeed should receive the death penalty when hunting endangered species. It definitly would deter a good many poachers to stop hunting these animals. In my opinion they are digusting vile pieces of garbage to think money is better than seeing a species still walk the earth and they need to see this. If they know their life is on the line the numbers are going to drop and give the endangered animal a little more of a chance. Of course their will always be those people who value money more than there life in which the death penalty is perfect for purging filth like them.
As for regular poachers that say poach a deer or something along those lines, they should get a hefty fine and maybe a couple years in prison but definitly not the death penalty. I mean yeah it's still makes them scum but they aren't killing something that has a population as few as a couple of 100.
So to summarize yes for endangered species and no for non endangered species. But I find them equally disgusting.