Spittlebugs feed on plant sap and then excrete bubbly foam to create a protective fortress around themselves. Later, they emerge as adult froghoppers.
How the Spittlebug Builds Its Bubbly Fortress - The New York Times
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ScienceTake: Moles on the Move - The New York Times
How the Spittlebug Builds Its Bubbly Fortress - The New York Times
How Bees Freshen Up - The New York Times
White foam with black spots : r/whatbugisthis
Spittlebug Superpowers Missouri Department of Conservation
To Survive, This Bug Builds a House of Bubbles
ScienceTake: Fluorescing Fish - The New York Times
Meadow Spittlebug - Wildlife in Winter
ScienceTake Tournament of the Ants - The New York Times