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The ability to rotate the fourth toe to accompany the first toe in opposition of the second and third toes is well known for the Osprey Pandion haliaetus, as an adaptation to have a stronger grip in catching and carry fish. The presence of a similar ability in the Grey‐headed Fish Eagle Haliaeetus ichthyaetus and Lesser Fish Eagle Haliaeetus humilis, not shared with other piscivorous eagles, has largely...
Eighteen- and 24-day-old albino mice, the former experiencing their first direct contact with solid food, were offered a set of food pellets, some of which had been gnawed by adult conspecifics of various conditions. No adult was present during the test. The subjects of both ages clearly preferred intact pellets over pellets gnawed by mice, although familiarity with the donor of residual cues had...
Pregnant albino mice were treated with 5-azacytidine so that the embryonic brains were affected late in their morphological ontogeny. The offspring showed retarded body growth and a conspicuous reduction in the size of the cerebral hemispheres as measured at the end of development. Histological alterations were found in the hippocampus and the cingulate cortex. No behavioral alterations were detected...
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