Identification - The Otter is a large member of the stoat and weasel (Mustelid) family. It has a flat head with a small broad snout, long thick tail and webbed feet. It feet are about 40mm across with four toes. Its body length can be up to 80cm with a tail length of up to 55cm. It has brown fur with a white front.
General ecology - Otters are semi-aquatic animals
The otter was once widespread in Essex but there was a rapid decline in the otter population in the early 1960's and the otter became extinct in Essex in the 1970's mainly due to poisoning from agricultural chemicals. Recently, otters have started to recolonise many of the rivers in Essex. Otters inhabit rivers, streams, lakes, marshes and also coastal habitats. As they are the top predator they occur in low densities naturally. They feed mainly on fish but are opportunistic hunters and will diversify - eat other foods
Surveying tips - otters are very secretive animals and it is easier to survey for signs such as spraints and footprints. The best time for surveying otters is March to the end of April.
For further information, training and survey forms, contact Mark Iley.
Photo - Chris Mason