Glasgow university student Pablo Garcia is pictured collecting otter spraints in Lochranza.
Two otters can be seen on a bed of kelp. Spraints provide important clues about their diets.
Photo Richard Shucksmith
A Glasgow University student who is studying the effects of microplastics in marine life is appealing to walkers and wildlife enthusiasts on Arran for assistance in collecting spraint (otter dung) samples as part of his dissertation research.