Hi 5! Can you guess who I was hanging out with on her trip to the dentist?
Hint: these animals have a very high tolerance to CO2, making their anaesthesia uniquely challenging. Rising CO2 levels is what stimulates the breathing reflex in most animals, so when a species such as this is able to suppress this reflex to a certain point, you can experience prolonged periods of apnea or "breath holding". This not only makes the monitoring of anaesthesia difficult, but also limits our ability to administer drugs via inhalation because often they'll just refuse to breathe it in!