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Some species of aphid, known as "woolly aphids" (Eriosomatinae), excrete a "fluffy wax coating" for protection. [29] The cabbage aphid, Brevicoryne brassicae , sequesters secondary metabolites from its host, stores them and releases chemicals that produce a violent chemical reaction and strong mustard oil smell to repel predators. [ 104 ]
Straw is commonly used as bedding for ruminants and horses. It may be used as bedding and food for small animals, but this often leads to injuries to mouth, nose and eyes as straw is quite sharp. The straw-filled mattress, also known as a palliasse , is still used by people in many parts of the world.