I haven’t tried the Daily Post in a number of years, but I was inspired by today’s theme: weathered. I wouldn’t be me if I didn’t put a zookeeper slant on it, though, would I?
Riverbanks Zoo has a herd of Galapagos Tortoises. We have Aldabra Tortoises at our zoo. These two species are a fascinating example of convergent evolution – animals that develop similar traits, but in different parts of the world. Galapagos Tortoises are found off the coast of Ecuador in South America, and Aldabs are found off the east coast of Africa in the Seychelles. They last shared a common ancestor about 20 million years ago. But they are so similar.
Here’s an Aldabra Giant Tortoise:
There are minor differences. Galapagos tortoises can get up to about 600lbs, depending on the subspecies, whereas Aldabs top out typically at 350. Though Big Al is a plus-sized model. He’s 525lbs. Galaps typically lack the little scale on their shell behind their neck, called a nuchal scute. Their shells vary, and some have really high arches at their necks to allow them to reach taller shrubs. And Galaps have a very round head by comparison to Aldabs, but you have to really know them to notice. My favorite difference is that Aldabs stretch out their necks to be scratched, while Galaps look straight up. ADORABLE!
The thing about both species is, they can live for, like, ever. Not really. Eventually they peter out, but they live a very, very long time. One animal died in 2006, and there were records on it going back 252 years, and it was a wild-caught animal. The oldest confirmed tortoise was 189 years old. That’s a lot of wear and tear.
Time takes its toll on all of us, tortoises included.
Time, wind, and water wear us down. The scales on this Galapagos tortoise girl’s neck have worn smooth with time. Her shell, too, sports that lived-in look. She had a nice hole in her carapace (top shell) that is now a cozy home to a spider.
She looks pretty good for her age, don’t you think? Just imagine, a century ago, she looked more like this:
This tortoise is under six months old, all shiny and pretty and new. There are plenty of growth rings in her shell, too. They are like trees. As they grow, they get new rings. The center of the ring is essentially dead shell, like our hair or fingernails, and the rings are fresh growth. This little baby is all bright-eyed and represents the future of her species.
And this girl? She’s bursting with history.
What do you think of when you hear the word “weathered?” Show us your best photos. Join this week’s Daily Post.