I too was sceptical at first about the black rat. I mean come on, a lvl 1 critter? But then I went to see for myself. Turns out this thing has friends. I found out that you are able to kite them to the forest the squirrels will take care of them for you. That is IF you can kite them. Do not attempt this solo. Oh and BTW, I had to rez at the GY because it was camping my corpse. So bring plenty of field repair bots, you'll need them.