Playing Favorites

I admit it. I know I’m not supposed to, but of all the little ones, I have a favorite. Don’t tell the others, please.

Astrochelys radiata, the radiated tortoise

I know that all the babies are adorable, but this one has a special place in my heart. The population of the radiated tortoise (Astrochelys radiata) has dropped by half in the last ten years. They have been wiped out of most of their range, so captive breeding programs are of critical importance. She’s the second one my zoo has hatched.

I call this one “she” because she was incubated as a female. Many reptiles have what is called temperature dependent sex determination. When the egg is first laid, the embryo within has no gender at all. The temperature at which it is incubated has an impact on whether they develop into boys or girls. Keepers can often produce the gender they need by altering the temperature at which they incubate the eggs. With this species of tortoise, higher temperatures usually yield more females. Lower temperatures tend to create males.

A perfectly proportioned tortoise in a tiny package

Here she is with her older sibling who was hatched in July. I have no idea whether the older one is male or female. Its egg incubated outdoors for a bit, so it was subject to unknown temperatures. Radiographs in a few years can tell if we’ve got a boy or a girl.

Pesky little sister

One thing I really enjoy about this baby is her personality. She is all go. I have no good recent pictures of her because she won’t sit still. From a biological standpoint, her curiosity isn’t a good thing because she might get eaten, but in captivity, it’s positively delightful.

I’ll be back on Monday full of my tales of adventure. And hopefully with some new pictures. Have a great weekend!

Advertisements

32 thoughts on “Playing Favorites

  1. Beautiful ! I didn’t know about the temperature and gender selection – very interesting. It makes sense too although it is at the whim of nature/weather rather than a faithful parent to warm the nest so that is a bit tricky. They have lovely markings don’t they? Are they symmetrical, it’s hard to tell from these shots. Gorgeous all the same.

  2. Adorable and educational, as always! “I always thought…that dogs laid eggs…and I learned something today!” – Peter Griffin. 😉

  3. Pingback: Things I learned this week « Peggy Isaacs

  4. My son has been a responsible rearer of reptiles and amphibians since he was a child. He never grew out of his love for furless pets. I adore them too, of course.

A penny for your thoughts! And by penny, I mean a warm-fuzzy in your heart.

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s