Christmas colors disguise gliding lizards in the rain forest

Christmas colors disguise gliding lizards in the rain forest

The work suggests that populations of the gliding lizard, Draco cornutus, have evolved extendable gliding membranes, like wings, which closely match the colors of falling leaves to disguise themselves as they glide between trees in the rain forest.

Found throughout South-East Asia, Draco is the only living genus of lizard with extendable gliding membranes -- call patagia -- which allow them to glide between trees in their territories.

One population has red gliding membranes, which match the color of the red falling leaves of their coastal mangrove forest habitat. The other population has dark brown and green gliding membranes, which match the colors of falling leaves in their lowland rain forest habitat.

They determined how the colors would be perceived by a predatory bird and found that the gliding membrane color would be indistinguishable from a falling leaf in the same forest.

Birds can see ultraviolet light as well as the colors that humans see, so it is important to take into account how closely the colors would actually match to a bird, Ms Klomp said.

The team filmed hours of gliding lizard behavior to observe how often the colors were displayed to other lizards. "We found that both the red and green/brown gliding membranes seem to have evolved to specifically resemble the falling leaves in each population's particular habitat, and are rarely used for communication," Ms Klomp said.

"Perhaps these populations may have originally had the same gliding membrane colors but as they have moved into different forest types their colors have adapted to closely resemble the colors of falling leaves in the different forests, known as divergent evolution."

 

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