Derwent Reservoir can be an interesting place to watch birds at any time of year. Wildfowl such as greylag goose, mallard, teal and tufted duck may be seen year-round, their numbers being swelled during autumn and winter by wigeon, pochard and goldeneye. Large flocks of gulls also congregate on the reservoir during the winter, most notably black headed, common and herring gull. Other species of interest include grey heron, goosander, cormorant and great crested grebe.