On coasts, waders will often work their way in one direction along the shoreline. This means that with a bit of planning, images can be obtained without disturbing the birds. Watch from a distance to see which way they are going, then move ahead of them and position yourself so they are coming towards you. I’ve often found that if you are lying prostrate on the ground, birds are much less bothered than when you are standing up. Looking at tide times is also important when shooting at the coast.
I always like to photograph wildlife from their level, and it’s no different with waders. The resulting images are far more intimate. Diffuse foregrounds and backgrounds mean the subject really stands out. Oystercatchers will provide a range of different images, from individual birds feeding to flocks roosting at high tide together. Birds will often fly up and down the coast, giving opportunities to photograph them in flight, and at high tide, large flocks can be pushed onto inland gravel pits. This gives the chance to photograph huge flocks as they wheel around together in the sky. Experiment with slow shutter speeds and motion blur. Try to keep your camera tracking the bird as well as possible though, to keep the head sharp.
Oystercatchers often fly up and down the coast Nikon D800, 400mm, 1/4000sec at f/7.1, ISO 500
At high tide, large flocks will gather Nikon D850, 400mm, 1/8000sec at f/6.3, ISO 1600