Insects such as stoneflies, mayflies, caddisflies, and dragonflies are common overwintering aquatic insects. Prey species include beetles, flies, mayflies, true bugs, ants, moths, lacewings, stoneflies, and caddisflies. Common insects found along the river include mayflies, stoneflies and caddisflies. The most commonly eaten foods include caddisflies, blackflies, mayflies, and stoneflies. The Eurasian crag martin may take aquatic species such as stoneflies, caddisflies and pond skaters. However, sculpins predation on stoneflies has reduced stonefly predation on trout eggs and their young. The foul odor attracts its pollinators&colon; scavenging flies, stoneflies, and bees. The shrew prefers aquatic insects such as stoneflies and craneflies. The Plecoptera are an order of insects, commonly known as stoneflies. Brachyptera is a genus of taeniopterygid stoneflies of mostly western Palearctic distribution. Nemoura is a genus of spring stoneflies in the family Nemouridae. Members of this family are commonly known as spring stoneflies or brown stoneflies. A similar structure in nymphal stoneflies (Plecoptera) is of uncertain homology. The scientists referred to the fossils as "Rolling Stoneflies". Stoneflies are found worldwide, except Antarctica.