Im always nervous about bat ring membrane. Its so stretchy. Does it not rip?

koryos:

No need to be nervous! Bat wing membrane is much stronger than human-made materials like rubber or plastic; the closest equivalent would probably be silicone. (AKA, the stuff used to make the wings for Bat Bot!) But unlike silicone, bats also have the ability to make their wing membranes stiffer or more flexible using rows of unanchored muscles beneath the skin. So if they happen to run into an obstacle, they can adjust it instantly.

Furthermore, bats have an incredible healing ability when it comes to their wings. They can heal almost any hole or tear, given enough time. Small puncture wounds are actually quite common, but the bats can still fly just fine as long as they’re not TOO big. Broken or fractured bones are much more likely to ground a bat than holes in the wing membrane, as a matter of fact.

Below you can see a western yellow bat with a large number of healed scars on its wing- this is more than you’d usually find, but it shows just how resilient they are!