Desert Tortoises

What exactly are tortoises? Tortoises are reptiles in the order Testudines that live on the land, in contrast to turtles which live in the water for the most part. 

Desert tortoises (Gopherus agassizii) are fascinating creatures only found in the deserts of the southwestern United States and northern Mexico. They have large, scaly front legs for digging.Their shell or carapace is dark brown with deep lines.


desert-tortoise


Desert tortoise facts:

  • They can live up to 100 years.
  • The females don’t lay eggs until they are at least 15 years old.
  • They dig burrows in the soil to stay cool in the hot summer.
  • They eat desert plants such as cactus fruit and wildflowers.
  • They hibernate in the winter.

Important note:  You should never pick up a wild tortoise. It turns out that one way a tortoise survives in such a dry environment is by holding urine in its bladder and recycling the water from it. If someone picks up or otherwise scares a desert tortoise, part of its defense is to urinate. Studies have shown that unless the tortoise can quickly replenish the supply of water that it lost by urinating, it is likely to dehydrate and die. Just shows that simple human curiosity can be fatal to other creatures and we need to be respectful of wild animals.

Activity 1. Desert Tortoise Drawing

Gather:

  • Art supplies such as crayons, colored pencils and markers
  • Photographs of desert tortoises, from books or the Internet
  • Drawing paper
  • Optional: coloring sheets to print out

Examine the photographs closely and draw a scene with a desert tortoise. 


African spurred tortoises


These African spurred tortoises are from the southern Saharan Desert.

Activity 2. Investigate the life cycle of a tortoise.

Tortoises, like other reptiles, hatch from eggs.


reptile-life-cycle


Tortoise-Hatchling

 


The babies hatch out when conditions are right.

Baby tortoise
"Baby tortoise" by Edgovan22 - Own work. Licensed under CC BY-SA 3.0 via Wikimedia Commons.


Tortoise group has a desert tortoise life cycle information sheet

© Roberta Gibson 2015