Hi all There is a 975 page book weighing at least 4 pounds, Migration Ecology of Birds, by Ian Newton that basically suggests that any bird for a whole host of reasons is capable of getting up going to odd places. Whether they are sedentary or migratory species, it doesn’t seem to make any difference. Sedentary species can become migrants and migrants can become sedentary species and there can be migratory populations within sedentary species as well as sedentary populations within migratory species.
I remember when the first Green Violet-ear appeared north of the border which stimulated the same discussion we are having now. then subsequent records began to appear, even one for Colorado. So it will be interesting to see if other Rufous-collared Sparrows begin to show up north of the border—is there any reason it couldn't happen!! Bob Righter Denver CO -- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/cobirds?hl=en.
