Otters
This reading profile brings together 5 source-linked articles that reference otters.
Explore Fauna’s source-checked field guides and research articles covering otters, or search the species catalog below for individual species profiles.Source-linked reading
- Field guideWhy sea otters use toolsA hard object can act as a hammer, a portable chest anvil, or a fixed anvil, letting an otter pry loose or fracture prey that teeth and paws alone handle less efficiently. The behavior is flexible rather than compulsory, and it is especially associated with hard-shelled snails and bivalves.
- Field guideHow mammal fur insulatesHair itself is only part of the insulation. A dense, deep coat creates small air spaces that resist convective mixing and conduct heat poorly; guard hairs protect the softer layer, and piloerection or seasonal growth can change the coat's effective thickness.
- Field guideReading a riverRiver habitat is distributed through the channel and its margins. Flow, depth, substrate, bends, tributaries, wood, banks, and riparian plants shape a moving patchwork that can change between visits.
- Field guideReading an estuaryEstuaries are partly enclosed waters influenced by coastal water and freshwater. Their depth, exposed area, currents, salinity, and wildlife access shift with tides, river flow, weather, and season.
- Field guideWhy animals playLook for actions that are modified from their ordinary function, repeated but not rigid, initiated in relatively relaxed conditions, and balanced by signals or self-handicapping; compare sequences before labeling them play.