Two-day old chicken embryos have what looks like a very reptilian tail with 16 vertebrae. Later in development, though, most of the vertebrae disappear until only five are left.
Scientist Hans Larsson, a palaeontologist at McGill University in Canada, conducted an experiment in November 2007 to gain more information about the evolution from dinosaurs’ long tails into birds’ short tails more than 150 million years ago. He discovered that, by manipulating the genetic make-up, he was able to extend the tail by a further three vertebrae.
Not quite a dinosaur, but a step in that direction.