The Yellow-Headed Blackbird

Clutch-size Manipulations in the Yellow-headed Blackbird: a Test of the Individual

To test the critical short-term predictions of the individual optimization hypothesis (IOH), Yellow-headed Blackbird (Xanthocephalusxanthocephalus) clutches ofthree and four eggs were experimentally enlarged or reduced by one egg, and broods were monitored until fledging. Predictions that control clutches would a) have greater fledging success than experimental clutches, and b) produce heavier ...

Combined Hepatocellular-Cholangiocarcinoma in a Yellow-Headed Amazon (Amazona oratrix)

A 9-year-old male Yellow-headed Amazon (Amazona oratrix) with a history of anorexia and vomiting died of a liver tumor. The tumor consisted of neoplastic cells with hepatocellular and cholangiocellular differentiations and their intermingled areas. Neoplastic hepatocytes showed islands or trabecular growth with vacuolated eosinophilic cytoplasm. Cells showing biliary differentiation formed duct...

A Comparative Study of Cowbird Parasitism in Yellow-headed Blackbirds and Red-winged Blackbirds

--We compared Yellow-headed Blackbirds (Xanthocephalus xanthocephalus) and Red-winged Blackbirds (Agelaius phoeniceus) to determine possible explanations for the lack of Brown-headed Cowbird (Molothrus ater) parasitism on Yellow-heads. Twenty-three cowbird eggs were cross-fostered from Red-winged Blackbird nests to Yellow-headed Blackbird nests. Eleven of the cross-fostered cowbird eggs hatched...

The Future of Blackbird Management Research

The Gold-Headed Cane

The Gold-Headed Cane, by WILLIAM MACMICHAEL, facsimile of 1827 ed., with introduction by Thomas Hunt, London, Royal College of Physicians, 1968, pp. 26 + 179, illus., £4. William Macmichael (1783-1839), M.D. Oxon., F.R.C.P., F.R.S., was educated at Bridgnorth Grammar School and Christ Church, Oxford. After graduating in Arts he studied medicine at Edinburgh and St. Bartholomew's Hospital, Londo...