Built-in polarizers form part of a compass organ in spiders
Article Abstract:
It has been possible to identify a unique compass organ in the spider Drassodes cupreus, where a pair of specialized secondary eyes work together to analyze skylight polarization. It appears that the secondary, or postero-median, eyes are polarization detectors designed for navigation at dusk. They function as a single organ by comparing the signals from the left and right eyes. A compass organ similar to that of D. cupreus can be inferred from the structure and configuration of the secondary eyes of many species from several spider families within the superfamily Gnaphosoidea.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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The secret of faces
Article Abstract:
A new study of male and female face shapes reveals that feminizing both makes them more attractive to the opposite sex. Feminized male faces are perceived by females to be better parents. It is suggested that such preferences may have limited sexual dimorphism, although masculinity may be advantageous in social dominance and competition.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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