Sediment Dynamics by Bioturbating Organisms
137
Fig.6.5. Trampling holes
made by Shelducks in
search of food on tidal
flats in the Dutch Wadden
Sea. Sand from the round
to oval holes deposited
on one side of the hole,
average diameter -40 cm,
depth 10 cm (size ruler
25 cm, for more information, see Cadee 1990)
Fig. 6.6. Circular holes with central mound produced by food-searching flamingoes
(photographed at the Banc d' Arguin, Mauritania, 1988 by Hermann Michaelis and
kindly made available)