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Messages in the mud

Salter’s Lode outfall at the TidalRiver Ouse. In the foreground, the otter’s scraped sprainting mound, otter prints in the background.
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Otter Project Update
The Middle Level Otter Recovery Project has been in operation for a year during which time 22 otter holts have been constructed on Middle Level watercourses. Of these,16 have been built into the banks and six constructed above ground. In addition, four mini holts were built. These are half size dens that will give temporary cover to an otter moving along the waterways and usually are built where an existing bush gives cover. Surveys of 62 bridges over Middle Level waterways in the spring revealed positive signs of otter, (spraints), at 18 of them. Lower numbers of bridges with spraints later in the year suggested a prospecting population rather than established breeding animals. The project has been supported by SITA Trust, which makes awards through the Landfill Communities Fund.
The idea that otters are shy creatures of the night that avoid contact with human activity took a bit of a knock one morning in October at Salter’s Lode. Middle Level workers Jules Carlile and Morgan Lakey noticed some fresh prints on the mud at 10:30am that had not been there when they started work at 8am, assisting the contractors that were replacing the guillotine door of the locks. On closer inspection, the tracks showed five pads confirming it had been an otter. The surprising fact was that the piling works had been in progress 30 yards away but the otter had felt confident enough to leave a spraint, (a distinctive scent message for other otters), on a mound of silt it had scraped up for the purpose, made a brief tour of the silt bank and carried on its way southwards along the tidal river bank.
Cliff Carson, Environmental Officer, MLC
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