The Inheritance of Clutch Size in the Great Tit (Parus major L.)

Abstract

had fledged.Six female ducklings fledged at 54 -t 4 days, and had an average of five primary feathers clear (rachis translucent); and six males fledged at 56 & 3 days, and had six primary feathers clear (P > 0.05).PRENUPTIAL MOLT The first prenuptial molt of Greenland Mallard males began shortly after fledging and was nearly complete at the time head plumage was replaced.Several males showed indications of green head-feathering at 75 days of age.All eight males in 1968 acquired completely green heads in an average of 118 -C 16 days (range 98-134).SUMMARY Captive Greenland Mallards, one generation removed from the wild, nested during mid-April in North Dakota.Forty-one eggs averaged 42.49 mm wide, 58.54 mm long, and 58.00 g.Artificial incubation to hatch-