Hedgehogs have two responses; the most usual for them is to curl up in a ball and wait the predator out, as they can't eat a hedgie when it's rolled up. The second is to run; they're surprisingly fast!
Their quills.
Yes, Badgers, Foxes, and Birds.
spikes
to protect themslfe
Only some species of octopus can shoot ink.
hedgehog
the giant australian hedgehog
It is their adaptation to protect them from predators and other sources of fear.
they blend in
"slip"
A hawk is a top predator, it does not need to escape predators.
Yes, beetles can jump to escape predators or reach food sources.