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Cuckoo spit. Froghoppers are a type of insect. Their young stages (nymphs) live inside a mass of froth. This froth can often be seen on a great variety of plants in early summer.

It is commonly known as 'Cuckoo spit', although it actually has nothing to do with cuckoos.

A Froghopper nymph in froth.  

The foam is produced by the nymph, which blows air through a fluid exuded from the anus.

Viewed under a microscope (left), the nymph could be seen blowing bubbles from its rear-end!

The froth protects the nymphs from drying out and may also help to deter predators.

The insects are known as froghoppers because the adults can have a somewhat frog-like appearance, as well as a great ability to jump.

They are a kind of bug, feeding on plant sap. They belong to the family Cercopidae.