In my recent holidays, it wasn't only the local Carrion Crows that visited the beach at low tide, Woodpigeons and Collared Doves regularly popped in. The first day I noticed a Collared dove on the sea defences pecking on something, when I looked closer I realised it was eating seaweed (Fucus spiralis, I believe), something I hadn't seen a bird do before.
Collared Dove enjoying some seaweed on the sea defences, as they do.
I took a video the following day.
In subsequent days I watched the visiting woodpigeons, which were keen beachcombers...
...but when a female landed on the beach, a male keenly followed her courting.
As the collared doves, they also ate seaweed, drank seawater (!) and waded in the waves. Don't take my word for it and watch the following clip.