First warm-blooded lizards switch on mystery heat source at will

The first known warm-blooded lizard, the tegu, can heat itself to as much as 10 °C above its surroundings – making it unique among reptiles.

But bizarrely, it only switches on its heating system at certain times of the year.

The discovery may add to the debate about whether dinosaurs were warm- or cold-blooded, or something in between – a bit like these lizards.

Read more here: First warm-blooded lizards switch on mystery heat source at will