In early summer you will hardly find a more charming plant in our meadows. Its pink flower clouds can be spotted from far away. On the stalks of this plant often small flocks of foam are sitting.  Those flocks are called cuckoo spit. It got nothing to do with the cuckoo, but with a tiny cicada. This cicada drills holes into the stalks and feeds from the cell sap of the plant. Obviously it got no table manners at all, for it blows into the cell like a little child blows with the straw into the lemonade glass and froths up the cell sap.