Crocodilians can heal from injuries and regrow lost toes, tails, and teeth. However, they cannot regrow limbs. This is because they have a low population of stem cells in their limbs.
A low-flying helicopter sparked a crocodile mating frenzy at a farm in Australia. Herpetologists are still trying to understand why, but there are a few possible explanations, including infrasound from the helicopter’s rotors.