It took a surprisingly long time for the other cogniscients to realise how much /they/ scared the humans too.
Of course, some got the message more quickly than others
Lo-grav worlds are rarer than high-grav ones. For reasons that become quickly obvious the more one learns of physics and biology.
When low-gravity life evolves, it happens in artificial environments.
Which are also targets for scavengers.
The spider-people of H'nuf'ruf learned of humans through such expeditions. They never saw humans as dangerous, and became their chief advocate for the species to join the Galactic Alliance.
It took them centuries to learn that humans were, by and large, terrified of them.
All that time, the H'nuf'ruf thought that screaming was a human greeting ritual.
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