Zoo's butterfly population is clearly booming

London Zoo is celebrating a population explosion in its glasswing butterfly colony, just two years after the insects were introduced.

Butterfly Paradise had just 10 of the species when it opened. Now there are more than 100 butterflies and caterpillars, as well as a large stock of eggs.

Native to central and South America, the insects have transparent scales which make it more difficult for predators to see them on leaves and flowers. They have a complex breeding technique that involves feeding on the decomposing bodies of other species and absorbing the pheromones to attract their own mates.

Keeper Ellie Stringer said: "We are delighted by the breeding success of these amazing butterflies. The fact that we have been able to create a self-sustaining ecosystem for them proves we are getting our exhibits right."