Spatial orientation of the chick embryo during the last five days of incubation

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The 1st opening (pip hole) appeared on the upper surface of the hatching egg of domestic fowl. This phenomenon is determined by density distribution and passive gravitational turning of the egg and embryo and possibly by additional behavioral factors. The latter may imply a sensory capacity for the recognition of the upward position and behavioral adjustment of this position in chick embryos 17 days old and older. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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