The Eurasian otter (Lutra lutra) has staged one of the most celebrated wildlife recoveries in Britain. Reduced to near-extinction by pollution and persecution in the 1970s, otters now occupy every English county following legal protection and water quality improvements. Their recovery is both a conservation triumph and an ongoing welfare story.
Otters are semi-aquatic carnivores, living along rivers, lakes, estuaries, and coastlines. They are primarily nocturnal and crepuscular, hunting fish, eels, frogs, and crustaceans. Otters hold large home ranges — males typically 20-40km of riverbank; females 10-20km — and are largely solitary except during breeding and when cubs are dependent on their mothers. Cubs stay with their mothers for 12-15 months, learning hunting skills before dispersal.
The otter's recovery followed three major changes:
Riparian habitat management is central to long-term otter conservation: maintaining bankside vegetation, reducing erosion, installing otter holts (artificial dens) in areas lacking suitable natural features, and managing waterside tree root systems that provide natural holt sites. The Environment Agency and Wildlife Trusts support otter habitat management through agri-environment scheme advice and direct habitat improvement.
Otter surveys typically use field signs: spraints (droppings with a distinctive musky smell), footprints in bankside mud, and signs of prey remains. The Otter Survey of England is conducted periodically by the Environment Agency. Camera traps increasingly supplement traditional survey methods.