Animal Dummies and Models – how could ethologists live without them
Dummies and models of animals can be very useful especially in studies that focus on big animals and those that move around much. One such use of models involved those of cows; cows with a pure white and a pure brown coat and models of white cows with 8, 16, and randomly distributed 64 brown patches on the white background fur. —>—>
Dawn of vision – And why blue light might be so special
Virtually all mammalian species exhibit some kind of circadian rhythm that affects their activities. These rhythms parallel the cycle of day and night and are, thus, in most cases linked to the perception of light. However, major surprises were in store for scientists, when they investigated whether mutant mice, lacking the well known image-forming rod and cone cells in their retinas, still possessed a circadian rhythm. —>—>
Unusual nests and places: you’d never think of this one!
Nests to shelter eggs, the young of a species and its parent(s) are constructions that are being employed by a wide range of very different animals. Nests may be made entirely from material that is produced by the nest maker alone as, for example, in spiders that spin a cocoon to house their eggs or as in anabantoid labyrinth fishes like the Siamese fighting fish and the South American catfishes of the genus Hoplosternum, which construct nests of air bubbles that these fish spit into a pile that then floats on the surface of the water.