. The Canadian field-naturalist. ANOMALOUS CONDITIONS IN THREE SPECIES OF BIRDS William Threlfall Department of Biology, Memorial University of Newfoundland, St. John's, Newfoundland Smith (1942) observed a meadowlark that had lost all its toes and part of its tarsi, while Ernst (1943) noted a Pied-billed Grebe with a deformed wing. Threlfall (1963) recovered an oystercatcher that had lost the whole of its left foot and toes 2 and 4 of its right foot. Harris (1964) recorded that at the end of the breeding season in a Herring Gull colony, on Skomer Island, West Wales, chicks were often seen wit
. The Canadian field-naturalist. ANOMALOUS CONDITIONS IN THREE SPECIES OF BIRDS William Threlfall Department of Biology, Memorial University of Newfoundland, St. John's, Newfoundland Smith (1942) observed a meadowlark that had lost all its toes and part of its tarsi, while Ernst (1943) noted a Pied-billed Grebe with a deformed wing. Threlfall (1963) recovered an oystercatcher that had lost the whole of its left foot and toes 2 and 4 of its right foot. Harris (1964) recorded that at the end of the breeding season in a Herring Gull colony, on Skomer Island, West Wales, chicks were often seen with broken and amputated wings. In none of these cases was the underlying bony structure of the mutilated or injured limbs examined. Tiemeier (1941) found evidence of repaired bone injury in some birds, while Abbott (1943) recorded two cases of bone repair in ducks. During a survey of the helminth parasite burden of marine birds in New- foundland four birds were collected in which anomalous conditions were noted. On 8 A-lay 1968, a Leach's Petrel (Oceanodroma leiicorhoa) with a deform-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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