WASHINGTON — To human thinking, songbird nests now seem to have evolved backwards: The most distant ancestor probably built complex, roofed structures. Simple open-top cup nests came later.
More than 70 percent of songbird species today build some form of that iconic open cup,
cheap jordans online
, evolutionary biologist Jordan Price said August 18 at the North American Ornithological Conference. Yet looking at patterns of nest style across recent bird family trees convinced him that the widespread cup style probably isn’t just a leftover from deepest bird origins.
Old bird lineages thought to have branched out near the base of the avian family tree tend to have plentiful roof-builders. Price,
cheap wholesale jordans
, of St. Mary’s College of Maryland,
cheap air jordans
, and coauthor Simon Griffith of Macquarie University in Sydney reconstructed probable nest styles for various branching points in the tree. That reconstruction suggests that open cups showed up independently four times among songbirds,
cheap jordan shoes
, such as in bowerbirds and honeyeaters,
cheap jordans free shipping
, the scientists conclude. Also,
cheap jordans
, here and there,
cheap jordans for sale
, some of the earlier cup builders reverted to roofs.
Price said he began musing about nest history while reveling in Australia’s birds during a sabbatical with Griffith,
cheap real jordans
. Evolutionary biologists have proposed that the broader Australasia region was probably the starting point for the rise of songbirds. Price said that it isn’t clear what drove a switch from protective roofs to what looks like the quick and dirty alternative of open cups.

http://users.atw.hu/ph...orum_topic&topic=9589

http://bjaeldemosegaar...hread.php?thread_id=21926

https://bahrainforums....p?p=13449170#post13449170