All of a sudden bushes are covered in cuckoo spit. This is the foamy substance secreted by the nymphs of froghoppers. The foam is made from the sap eaten by the nymphs and is a form of protection from predators.
Cuckoo spit gets its name because it can be seen at the same time that cuckoos are heard.
Froghoppers are a member of the Homopteran family which includes aphids. The adults are well camouflaged and can jump really well,many times their own size,hence their name.They use both these strategies to avoid predators.