The relationship between foot-movements and feeding in shore birds

I S H O U L D L I K E to make some observations which may serve to cast a different light upon the subject of foot-movements in shore birds, since in the literature there is a tendency to associate this behaviour with the luring of worms to the surface of the substratum. Swennen and van der Baan (1959) refuted this for marine worms, but, together with Simmons (1961), tended to propagate the idea t...