The Ambystoma mexicanum, or axolotl, has lived a quiet life in the dark waters of Xochimilco since before the Aztecs established their empire in the Valley of Mexico. With its sludgy-brown ...

They introduced an axolotl in 2021 and were quick to roll out a capybara — the world’s largest rodent — this year. “The capybara was one you could see coming,” John says. “It was ...

In fact, Monaghan says, axolotls are "the longest standing lab animal of any animal, longer than flies, longer than worms, longer than mice." The first scientific specimens were collected in 1864 ...