Behavior of the Australian Musk Duck and Blue-Billed Duck

Behavior of the Australian Musk Duck and Blue-Billed Duck

Sexual Size Dimorphism of the Musk Duck

—We examined sexual size dimorphism of a lek-displaying diving duck from Australia, the Musk Duck (Biziura lobata). Like other lek-displaying species, Musk Ducks exhibit extreme sexual size dimorphism in addition to structural dimorphism. Body mass ratios (male:female) for Musk Ducks are among the highest reported for birds (more than 3:1). Multivariate analyses of 16 anatomical measurements in...

Paleontology: A Cock’s Comb on a Duck-Billed Dinosaur

A soft tissue structure has been discovered on the head of the duck-billed dinosaur Edmontosaurus. Its similarity to a cock's comb and other sexually dimorphic structures of birds suggests that potential sexual signals existed in these extinct animals.

Broad-scale genetic population structure in blue duck Hymenolaimus malacorhynchos

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The Reponse of Duck Erythrocytes

AB STR ACT This paper presents evidence that duck erythrocytes regulate their size in isotonic media by utilizing a previously reported "volume-controlling mechanism." Two different experimental situations are examined. In the first, cells enlarge in a solution containing norepinephrine and an elevated [K]o; and in the second, enlarged cells shrink to their original size if the norepinephrine a...