Posted: Apr 30, 2012 7:37 pm
Asyncritus wrote:
That’s curious, and not consistent with the facts. Let me remind you that the swallows arrive at the specific location in Capistrano on the 18th March precisely, every year, and leave on Oct 23rd. They must, therefore, have a GPS and a calendar built in somewhere. So
The cliff swallows don't nest at the Mission in Capistrano any longer because the environment changed.
They didn't arrive precisely the same date every year nor leave Argentina on precisely the same date every year.
There are large populations of cliff swallows in lower South America that migrate back and forth, to and from the US south west.
The cliff swallow nests wherever the environment is right. They are all over the place. On cliffs, under bridges, and yes, until the environment changed, under the eves at the mission in Capistrano.
They follow a north/south migratory path that is determined by change of seasons and environment.
Only a certain number of birds can nest at any one place so they spread out. If a good place to nest is filled up they move on.
Cliff swallows use preexisting nests if they can find them, explaining why cliff swallows used the mission at Capistrano, but there is no evidence or reason to believe that they use the same nest year after year, or the same nesting site.
Also Pacific golden plovers are wide spread across the far north of north America and Asia in summer and winters all over the fucking place, from south Asia to California. They go north in summer and south in winter.
So, you have misrepresented to species of migratory birds that you seem to no fuck all about, what's next? Oh yeah eels.