My contribution to the humans are space orcs, it’s probably been seen before but oh well.
So, You guys know about pursuit/persistence hunting right? Where we just follow the prey without stopping until it slows down or drops dead from fear and exhaustion?
What if when aliens first discover earth, the thoughts of these bipedal predatory omnivores are bad enough but we seem pretty obsessed with farming our food so maybe we aren’t much of a threat.
Once humans are zipping about in space, that’s when they realise that these harmless bipedal omnivorous farmers are actually hunters who just never give up.
If someone hurts their crew, they just follow it for days before killing it. These soft fleshy things are terrifying. These soft fleshy things may not be the strongest or fastest but we are some of the hardest damn things to kill because we just won’t die and if we survive we won’t stop until we get you.
We farm things because we can and because it’s easy. Not because we have to in order to survive.
We farm things because we’re too busy fighting each other to hunt for everything.
We stake out areas, we mimic its noises, we stalk it, we put ourselves in danger to kill a food source for fun.