2013 Sept Nature News – When Desert Tortoise Journeys

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2013SepNN_Gail-A-happy-well-fed-adopted-desert-tortoise

A happy, well-fed, adopted desert tortoise

It appears a simple life, but observe the shiny eyes of a desert tortoise and you’ll find an awareness there, his measuring of you. I’ve left my rare tortoise encounters reluctantly, the power of my gaze never enough to pierce the mystery. Perhaps the tortoise’s presence comes from his ancient lineage which dates back 50 million years. Perhaps it’s the stubborn struggle his lifestyle represents.

The desert tortoise can survive an entire year without drinking water, but given the opportunity will drink deeply from pools of rainwater. He also absorbs moisture from the green plants and cactus fruits he eats. The moisture is accumulated in his oversized bladder, where large amounts of water can be stored along with urinary wastes. This water becomes available to the tortoise due to his built in waste disposal system. A well-hydrated tortoise can add dry plants and forage to his menu. The desert tortoise lives out his life in a 1- to 2-mile range that’s centered on his burrow. The burrow insulates the cold-blooded reptile from extremes of hot and cold and allows him to moderate his body temperature. In a typical year, tortoises hibernate from October to late April.

The highlight of the year is the monsoon, when desert tortoises journey in search of food and mates. These reptiles don’t breed until they are at least 12 years old, and some not until 20. With luck, many of a tortoise pair’s 3-12 eggs will hatch. The hatchlings emerge in late summer measuring just two inches across. They have soft shells and are extremely vulnerable to a wide range of predators.

It’s against the law to take a desert tortoise out of the desert, as this is a protected species. Individuals taken away from the habitat and then returned present a disease risk for the rest of the population. Even picking a tortoise up can cause it to release the precious contents of its bladder, which may mean death in a dry year.

People interested in adopting rescued orphans may provide custody for a non-releasable tortoise if they agree to meet feeding, burrowing and shelter requirements for the animal.

For information, contact azgfd.gov.

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