"The One Winged Snake can glide in the air. It's called one winged, but it actually just elongates the sides of it's skin to make a makeshift wing. It does this on it's left or right side to change directions mid-air. It usually attacks from branches of tall trees and used it's tail to push against the tree so that it can fly towards it's prey faster.
They're highly venomous, so it's a risky creature for me to catch and I have no plans on putting my live on the line for a little bit of riches.
As for the Iron Centipede, they're just a bigger versions of the normal centipedes with the adults reaching a length of half a meter and their shell is extremely hard. On top of that, they can further increase the hardness to make it as hard as iron and that's where their name comes from. They're relatively easy to capture but no one wants them as their body parts are literally useless. Their shell without the hardening, isn't really valued that much.