'Acorn' and 'Goose' are the two basic types of what, often found on large sea mammals?
Goose barnacle Goose barnacle Goose barnacles (order Pedunculata), also called stalked barnacles or gooseneck barnacles, are filter-feeding crustaceans that live attached to hard surfaces of rocks and flotsam in the ocean intertidal zone. Some species of goose barnacles such as "Lepas anatifera" are pelagic and are most frequently found on tidewrack on oceanic coasts. Unlike most other types of barnacles, intertidal goose barnacles (e.g. "Pollicipes pollicipes" and "Pollicipes polymerus") depend on water motion rather than the movement of their cirri for feeding, and are therefore found only on exposed or moderately exposed coasts. In the days before it was realised that birds
Goose bumps is known as piloerection or the pilomotor reflex. It occurs in many mammals besides humans; a prominent example is porcupines, which raise their quills when threatened, or sea otters when they encounter sharks or other predators. The phrase "goose bumps" derives from the phenomenon's association with goose skin. Goose feathers grow from stores in the epidermis which resemble human hair follicles. When a goose's feathers are plucked, its skin has protrusions where the feathers were, and these bumps are what the human phenomenon resembles. It is not clear why the particular fowl, goose, was chosen in English, as most other