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Komodo dragons are known as formidable hunters, and approaching them is not for the faint-hearted (for a vivid example, the National Zoo describes their hunting method as: 'The dragon’s primary tactic is straightforward: attempt to knock the prey down and dismember it'). However, Castor, a Komodo dragon at the Denver Zoo, defied this fearsome stereotype.
In 2009, while cleaning Castor’s habitat, zookeepers observed a lack of tail drag marks in the soil, suggesting limited movement. They also noticed he spent excessive time in his pool, remaining so still that algae started forming on his skin. X-rays revealed the 15-year-old lizard was suffering from osteoarthritis in both hind limbs.
Veterinarians initially treated Castor with oral medications, concealed in smelts and rodents he consumed. When his condition showed no improvement, they opted for an alternative strategy and consulted a specialist.
Tammy Wolfe, a seasoned physical therapist, has a unique professional background. After 20 years of working with humans, she shifted her focus to animals. Certified in canine rehabilitation, she operates The K9 Body Shop, a clinic offering physical therapy for dogs and cats. She has also collaborated with zoos to treat a variety of exotic species, including camels, sea lions, flamingoes, coatimundis, antelopes, and hawks. Castor, a Komodo dragon and descendant of one gifted to George H.W. Bush by Indonesia's president, became her first venomous lizard patient. Eager to assist, she began regular therapy sessions with him in 2013.
In a recent paper detailing Castor’s treatment, Wolfe and the zoo’s veterinary team explain how they applied a therapy method Wolfe developed to redistribute the physical strain on the lizard’s body during movement. They initiated the process with delicate “micromovements” targeting his spine and pelvis, later incorporating regular massages, particularly focusing on his right hind leg.
Within weeks of consistent therapy, Castor’s caretakers observed him spending less time in the pool and becoming more active in his enclosure. By the ninth week, he was running (Komodo dragons can sprint up to 13 mph), and a week later, he successfully climbed a 12-inch step in his habitat—a feat he hadn’t accomplished in years.
Although the therapy significantly enhanced Castor’s mobility and overall well-being for a period, his caretakers noticed severe difficulties in his hind leg movement this past July. Consequently, they made the compassionate decision to euthanize him. He was 21 years old at the time.
“Castor was an extraordinary animal, and his absence will be deeply felt,” said Brian Aucone, the zoo’s Vice President of Animal Care & Conservation, in a statement. “While such decisions are never easy, this was the right choice. We will all miss him dearly, but we take solace in knowing he enjoyed a long, fulfilling life here at the zoo. It was simply his time.”
