La faune de l'Amérique du Nord . 1 2 3 10 1 12 Total 213 tubercules. 425 10 26 21 .. » Trace. Il y a beaucoup de variation dans les aliments pris par differentindividuals dans le même habitat et en même temps. Deux oiseaux col-gistrement d'un marais salé sur la Choptank River dans le Maryland 1961 inFebruary présente un contraste intéressant. Un entirelyon oiseaux nourris de poissons, alors que la B a mangé un large assortiment offoods plutôt inhabituelle et dont les graines de la flèche-arum, micocoulier (Celtis occiden-talis), à feuilles de renouée perfoliée hallebarde (Polygonum arifolium),(cornouiller Cornus florida), et du raisin (Vitis sp.). Bird B avait également mangé

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North American fauna . 1 2 3 10 1 Tubers 12 21 3 Total. 42 5 10 .._ 26 21 » Trace. There is considerable variation in food items taken by differentindividuals in the same habitat and at the same time. Two birds col-lected from a tidal marsh on the Choptank River in Maryland inFebruary 1961 present an interesting contrast. Bird A fed entirelyon fish, while bird B ate a wide and rather unusual assortment offoods including the seeds of arrow-arum, hackberry (Celtis occiden-talis), halberd-leaved tearthumb (Polygonum arifolium), dogwood(Cornus florida), and grape (Vitis sp.). Bird B had also eaten cray-fish and a snail (Gastropoda). The seeds of arrow-arum containcalcium oxalate crystals and apparently are rejected by virtually allwater birds except the Wood Duck (Aix sponsa). This was the onlytime I encountered them during my studies of rail foods. Only in the Arkansas ricefields has a fairly complete seasonalsurvey of King Rail foods been made (Meanley, 1956, p. 252-258). NATURAL HISTORY OF THE KING RAIL 77. Figure 31.—Foods of the King Rail in brackish bay marsh, Broadway Meadows, Kent County, Del.: (1) Mud crab (Sesarma reticulation); (2) red-jointedfiddler crab (Uca minax) ; (3) clam (Macoma balthica). (Photograph byFrederick C. Schmid.) Small series of stomachs have been collected from a few other local-ities. Most of these were examined by John C. Jones of the U.S. Fishand Wildlife Service. ARKANSAS RICEFIELDS In the Grand Prairie rice-producing area near Stuttgart, Ark., 118stomachs were collected between 1950 and 1955 by Karl Kitler andmyself (table 12). Animal life comprised 79 percent of the King Rails annual diet.It constituted 90 percent or more in spring and summer, dropped to74 percent in the fall (the largest number of stomachs were collectedin November and may have made the figure lower than if there hadbeen better representation of the early part of this season), and wasstill lower (58 percent) in winter. The shift in feeding grounds from roadside di

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