Regeneration in the wild
A lost limb is of little concern to these remarkable creatures
The Indo-pacific starfish genus Linckia can regenerate a lost arm or even its entire body from a single separated arm.
Giant day gecko
These lizards can detach their tail as a defence mechanism then regenerate a replacement with a rod of cartilage.
These jellies are arguably the real-life Time Lords, able to revert to their younger cellular polyp form.
Similarly to the giant day gecko, the salamander is able to lose limbs such as arms in a bid to escape and then regenerate them over time.
When mating, males will detach their hectocotylus and leave it in the female. They will regenerate a new one later.