Hooray for heatwaves!

The swallowtail is Britain's largest native butterfly and it looks like an escapee from a tropical butterfly house - a spectacular insect with tigerish yellow-and-black stripes and flamboyant tails on its wings.

Despite its size and power, it is also one of our rarest species, confined now to the Norfolk Broads due to its requiring large areas of undrained marshes which contain its caterpillar's food plant, milk parsley.