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White-crowned sparrows (Zonotrichia leucophrys): foraging preferences in a risky environment

✍ Scribed by Thomas Caraco

Publisher: Springer
Year: 1983
Tongue: English
Weight: 760 KB
Volume: 12
Category: Article
ISSN: 0340-5443
DOI: 10.1007/bf00296934

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## Abstract Plasma levels of LH were measured through the course of 24 hours in photosensitive and photorefractory, adult male white‐crowned sparrows, __Zonotrichia leucophrys gambelii__, exposed to both long (20L, 4D) and short (8L, 16D) days. In photorefractory birds held on both long and short d