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The marking behaviour of otters was studied around a sea loch in northwest Scotland, 32 km of shoreline being examined. Twelve used holts were found. They were situated in rocky outcrops and the average interholt distance was 1,100 m (range 450h—2,000 m). Holt entrances were heavily marked with spraints. Large accumulations of spraints (»lavatories«) tended to occur between holts and may have served as signals for otters travelling along the shore. Sixty-two per cent of 168 sprainting sites were within 150 m of holts. Otters in this area appear able to tolerate a certain level of disturbance from human activities. The marking behaviour of otters is discussed in relation to resources. (Dept. Zool. & Com. Physiol. Univ. Birmingham, Birmingham, U. K. (SMM) and Dept. Biol., Univ. Essex, Colchester, U. K. (CFM).

Observations on the marking behaviour of a coastal population of otters