The black isn't hard because it poisons but is aggressive and doesn't give a ****. The spider could well be the same but i feel you need a better marketing campaign. Something along the lines of......
"The wandering spider wanders the jungle floor, rather than hiding in a lair or a web because...
I nominate the shrew.
It takes on snakes and scorpions despite being pretty much blind. Its signature death move is skull crushing and whilst it has venom, it doesn't often use it to kill.