How do X-ray studies place turtles in the tree of life?

Turtles are like ancient puzzle pieces that scientists use X-ray studies to fit into the big picture of all living things.

Imagine you have a box full of different puzzles, some look like dogs, others like cats, and one looks like a turtle. Scientists want to know where the turtle puzzle fits in with the rest. To do this, they use X-rays, which are like invisible pictures that show what’s inside something without breaking it open.

When scientists take an X-ray of a turtle's bones, it’s like taking a picture of its skeleton while it’s still in its shell. This helps them see how the bones are shaped and connected, just like looking at the pieces of a puzzle to figure out where they belong.

By comparing these X-ray pictures with those from other animals, scientists can find similarities and differences. If a turtle shares many bone shapes with another animal, it means they might be related, like cousins in a big family tree.

Sometimes, the turtle’s bones look more like a lizard's than a bird's, which tells scientists that turtles are probably closer to lizards than birds on the tree of life. It's like finding out your turtle cousin is more like a lizard cousin than a bird cousin!