Scientists take temperatures of butterflies to uncover climate threat

Study finds some species are less able to control their body heat and are more vulnerable

Catching nearly 4,000 wild butterflies with handheld nets and taking the temperature of each tiny insect must rank among the more arduous of scientific endeavours.

However, researchers have discovered significant differences in the ability of British butterflies to maintain a suitable temperature, raising fears that global heating will threaten the populations of some species.