Losing tails turn lizards' jumps into uncomfortable somersaults

Washington, Feb 15 (ANI): A new research has suggested that escaping lizards probably pay a significant ecological cost for losing their tails while escaping predators, in the sense that their jumps turn into uncomfortable somersaults.

According to Gary Gillis from Mount Holyoke College, USA, up to 50 percent of some lizard populations seem to have traded some part of their tails in exchange for escape.

•   E-mail Article
•   Printer Friendly
•   Text-Size    

This made Gillis wonder how this loss may impact on a lizard's mobility and ability to survive. Specifically, how do branch hopping, tree dwelling lizards cope with their loss.

Teaming up with undergraduate student Lauren Bonvini, the pair began encouraging lizard leaps to see how well the reptiles coped without their tails.

Constructing a jumping arena from boxes and fine sandpaper, the duo gently encouraged arboreal Anolis carolinensis (anole) lizards to launch themselves from a 11cm high platform as they filmed the animals' jumps.

The animals performed well, launching themselves by pushing off with their back feet and landing gracefully, covering distances ranging from 14.9-29.9 cm.

But, the researchers wanted to see how well would the animals perform without their tails.

Encouraging the lizards to drop their tails by holding them, just like a hungry predator would, Bonvini then persuaded the tailless reptiles to jump while Gillis filmed them.

As soon as the first animal took to the air, Gillis knew something was different.

"It looked weird. The animals became blurred as they jumped," said Gillis.

Replaying the animal's jump in slow motion, the team could see that the animals were tumbling backwards uncontrollably as their tail stump flailed around.

Filming other tailless anoles, three more backflipped out of control, although two others seemed to manage their trajectories better.

Teaming up with Duncan Irschick to analyze the reptiles' leaps, the team could see that everything about the tailless lizards' take off was exactly the same as it had been before they lost the appendage.

Things only started to go wrong as they left the jump stage.

The lizards began flipping back by more than 30 degrees. Some tumbled so far that they landed on their backs.

The team also realized that as the animals took off, they raised the base of their tails as the rest of the appendage trailed along the ground, as if it was somehow stabilizing the take off.

"If jumping and landing are important for lizards, they are really compromised," said Gillis. "Coordinated landing on a branch is out of the question when spinning backwards," he added.

Thus, escaping lizards probably pay a significant ecological cost for their life saving quick release system. (ANI)