Dramatic snake colour-change mystery solved

Dec 06, 2006
Dramatic snake colour-change mystery solved
An adult green python (top) and a spectacular yellow juvenile green python. Credit: Australian National University

The mystery surrounding a snake that undergoes a spectacular colour change has been solved by ANU ecologists who have found that the skin of the green python – which begins life either bright yellow or red – transforms to blend into a new habitat as the snake gets older.

Dr David Wilson and Dr Robert Heinsohn from the Centre for Resource and Environmental Studies at ANU, with Professor John Endler of Exeter University, solved the mystery after a three year study radio-tracking the green python at Cape York Peninsula.

“Animals sometimes change colour during their lives, but none as dramatically as the green python of northern Australia and New Guinea. It has puzzled evolutionary biologists for decades,” Dr Heinsohn said.

“This beautiful reptile is popular in the pet trade because it hatches either bright yellow or red, but eventually turns emerald green. It turns out there is a very good reason for this dramatic change.”

For the study, published this week in the scientific journal Biology Letters, the researchers radio-tracked a large number of juvenile and adult pythons and analysed their colours using advanced spectrophotometry.

To their surprise, they found that the brightly coloured youngsters live in a completely different habitat to the older snakes. The juveniles remained outside the rainforest where they hunted small prey such as skinks and cockroaches, whereas the adults moved into the rainforest canopy to hunt rodents and birds.

The juvenile yellow and red colour allows them to blend in remarkably well with the multi-coloured leaves and grass at the forest edge. The adult green allows them to hide from their predators as they hunt for birds and rodents in the canopy.

“It was only when we established the total divergence in behaviour of the juveniles and adults that we could begin to understand their remarkably different colours.

“It takes a year before the young ones are large enough to catch bigger prey like birds. They then shed their skins, change to green, and move inside the rainforest to try their luck off the ground.

“Drab juveniles are the norm in the animal world, but the brightly coloured young of green pythons are unique. They are helping us to understand where the bright and beautiful colours seen in nature come from and how they are maintained,” Dr Heinsohn said.

Source: Australian National University

Explore further: Norway tests out 'animal rights cops'

Related Stories

Recommended for you

Norway tests out 'animal rights cops'

7 hours ago

Norwegian police is creating a unit to investigate cruelty to animals, the government said Monday, arguing that those who hurt animals often harm people too.

High-pitched sounds cause seizures in old cats

9 hours ago

When the charity International Cat Care asked veterinary neurologists at Davies Veterinary Specialists, UK, for help with several enquiries it had received regarding cats having seizures, seemingly in response ...

Rare dune plants thrive on disturbance

10 hours ago

Beginning in the 1880s, coastal dunes in the United States were planted with European beachgrass (Ammophila arenaria) in an attempt to hold the sand in place and prevent it from migrating. The grass did th ...

How an RNA gene silences a whole chromosome

12 hours ago

Researchers at Caltech have discovered how an abundant class of RNA genes, called long non-coding RNAs (lncRNAs, pronounced link RNAs) can regulate key genes. By studying an important lncRNA, called Xist, ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.