No Tricks, Just Treats for Komodo Dragon at the San Diego Zoo

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Ratu, a Komodo dragon, uses her tongue to “smell” where her treat awaits.

Animal care staff at the San Diego Zoo got into the Halloween spirit this morning, with carved pumpkins for the world’s largest lizard. There were no candles to light the jack-o’-lanterns, but keepers filled the gourds with trout and ground elk meat drizzled with fish blood, for a 4-year-old Komodo dragon. Ratu, which means “queen” in the Indonesian language, could see the orange gourds, but it was the action of flicking her tongue that allowed her to locate the meat, which is part of her daily diet. Putting her food inside the jack-o’-lanterns encourages the animal’s natural behavior of scavenging and foraging.

Komodo dragons are carnivores that detect odors by sending their long, yellow forked tongue to sample the air and then delivering it to the roof of the mouth, making contact with an auxiliary olfactory sense organ called the Jacobson’s organ. The chemical analyzers in that organ are able to “smell” airborne molecules—and if the concentration present on the left tongue tip is higher than that sampled from the right, the Komodo dragon will follow the stronger scent to the food.

The Komodo dragon is the largest lizard in the world and is the apex, or top predator in its native range on Komodo, Rinca and Flores islands in Indonesia. They are known to scavenge from carcasses or stalk animals ranging in size from small rodents to large water buffalo. Komodo dragons can detect carrion from an estimated 2.5 miles away, and will actively seek it out. Its jaws, muscles and throat allow a Komodo dragon to swallow huge chunks of meat rapidly, while its stomach expands easily, enabling an adult to consume up to 80 percent of its own body weight in a single meal.

The International Union for Conservation of Nature (IUCN) lists the Komodo dragon population as vulnerable. Laws have been in place to protect the Komodo dragon since the 1930s, and international trade is prohibited by Appendix I of the Convention on International Trade in Endangered Species (CITES)

Bringing species back from the brink of extinction is the goal of San Diego Zoo Global. As a leader in conservation, the work of San Diego Zoo Global includes on-site wildlife conservation efforts (representing both plants and animals) at the San Diego Zoo, San Diego Zoo Safari Park, and San Diego Zoo Institute for Conservation Research, as well as international field programs on six continents. The work of these entities is inspiring children through the San Diego Zoo Kids network, reaching out through the Internet and in children’s hospitals nationwide. The work of San Diego Zoo Global is made possible by the San Diego Zoo Global Wildlife Conservancy and is supported in part by the Foundation of San Diego Zoo Global.

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