Which insect gives off the froth known as cuckoo spit
Froghopper which produces a cover of foamed-up plant sap resembling saliva; the nymphs are therefore commonly known as spittlebugs and their foam as cuckoo spit, frog spit, or snake spit. The final family in the group, the Machaerotidae, are known as the tube spittlebugs because the nymphs live in calcareous tubes, rather than producing foam as in the other families. The foam serves a number of purposes. It hides the nymph from the view of predators and parasites, and it insulates against heat and cold, thus providing thermal control and also moisture control; without the foam, the insect would quickly dry
Froth flotation forming a froth. The froth is removed from the cell, producing a concentrate ("con") of the target mineral. Frothing agents, known as "frothers", may be introduced to the pulp to promote the formation of a stable froth on top of the flotation cell. The minerals that do not float into the froth are referred to as the "flotation tailings" or "flotation tails". These tailings may also be subjected to further stages of flotation to recover the valuable particles that did not float the first time. This is known as "scavenging". The final tailings after scavenging are normally pumped for disposal