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They range from seven to 14 centimeters wide, which is similar to tracks of modern-day shorebirds, such as small herons and oystercatchers.

It has 20% of the UK's hen harriers, 11% of its breeding seabirds and vital populations of curlew, lapwing, and oystercatcher.

"Brownsea Island is a part of an internationally important wetland and marine conservation zone, and is a haven for wildlife, including oystercatchers and sandwich terns," a spokesperson said.

This also is an excellent bird-watching spot for black oystercatchers and harlequin ducks.

The group has been fighting to preserve Wilhelmshaven’s lush wetlands, which are home to oystercatchers and swallows and attract migrating cranes, geese and ducks.