 The western end of the loch is the location of the largest heronry in the Lothians which had 27 nests in 2017.Other breeding species include Canada goose, mute swan, tufted duck, great crested grebe, sparrowhawk, sedge warbler and reed bunting.Non-breeding visitors to the loch include a number of other species of wildfowl as well as records of rarer species such as smew, ring-necked duck, ruddy duck and Great bittern.