Unusual Nesting Sites of Brown Thrasher and Yellow-Shafted Flicker

Comparative reproductive success of Yellow-shafted, Red-shafted, and Hybrid Flickers across a hybrid zone

-Alternative hypotheses of hybrid zones make specific predictions about reproductive components of fitness in the hybrids. The dynamic-equilibrium and reinforcement hypotheses are premised on reduced hybrid fitness, which should be apparent as reduced clutch or brood size or as increased embryonic mortality. The hybrid-superiority and introgression hypotheses predict normal clutch and brood siz...

Predation by Gray Catbird on Brown Thrasher Eggs

The gray catbird (Dumetella carolinensis) has been documented visiting and breaking the eggs of artificial nests, but the implications of such observations are unclear because there is little cost in depredating an undefended nest. During the summer of 2001 at Konza Prairie Biological Station, Kansas, we videotaped a gray catbird that broke and consumed at least 1 egg in a brown thrasher (Toxos...

Bees: Their Nests and Nesting Sites

P 448 Blue on yellow full field flicker test

m. To establish a quick and easy test to examine flicker functions of the blue-sensitive pathway in a clinica: setting. Method. A strong steady orange adaptation light was used to suppress the red and green cones. Adaptation and stimulation lights were superimposed evenly in a ping-pang ball cut in half and placed close to the eye. This provided a large stimulus field (90 ") making fixation not...

a comparative study of nesting sites and burrowing habits of two iranian burrowing scorpions

background: the different features of scorpions can be successfully described by their nesting and burrowing behaviors. there is little information about burrowing activity of iranian scorpions. methods: the current study was performed to compare the burrowing behavior between two burrowing iranian scorpions, scorpio maurus and odonthubutus bidentatus by describing 30 nests of each species rega...