Риби креветки та інші водні істоти утворюють зграї та ковбаняться разом

When fish, shrimp or other aquatic creatures swim together in a loose cluster, this is typically called a shoal. It can be a mix of different species. A school is a group of the same fish species swimming together in synchrony; turning, twisting and forming sweeping, glinting shapes in the water. Fish probably do this to confuse predators and to save energy (by using the ‘slipstreams’ of other fish). Pods are herds of marine mammals including whales, dolphins, walruses and seals

National Geographic