The Hummingbirds should be arriving in north Texas about now. And they'll be tired and hungry after their migration. Last Tuesday they were just south of us, but rain may be slowing them down a bit. My favorite web site to keep track of their arrivals (and where) is the migration maps at www.hummingbirds.net
Looks matter to Barn Swallows Research has found
that even after Barn Swallows have paired up for the season, females constantly
judge their mates by their looks, in particular by the reddish color of the
males’ breast and belly feathers. Females that paired with males with paler (less
desireable) feathers were more likely to secretly copulate with another male.
Cornell’s Laboratory of Ornithology also found that females paired to males with the reddest feathers cheated less. As a result, those males fathered a greater proportion of
young. Cornell
speculates that the intensity of the reddish color is an indicator of the
male’s health and ability to raise young - key to the evolution of the species
over the generations.
Cornell’s Laboratory of Ornithology also found that females paired to males with the reddest feathers cheated less. As a result, those males fathered a greater proportion of
Barn Swallow |
OWEN YOST, in addition
to being a blogger, is a licensed Landscape Architect emeritus who has lived
and worked in north Texas for over 30 years. He is the recipient of a Lifetime
Achievement Award of the Native Plant Society of Texas, and is a member of the
American Society of Landscape Architects (ASLA), International Federation of
Landscape Architects, National Wildlife Federation and the Audubon Society. His
office is at Yost87@charter.net in Denton.
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