Hi all Latest BirdCast forecasts showing early signs, too, http://www.friendsofthepawneegrassland.org/pages/BirdMigration
Thanks Gary Lefko, Nunn http://www.friendsofthepawneegrassland.org/ https://www.inaturalist.org/projects/birds-and-more-of-the-pawnee-national-grassland On Thursday, March 4, 2021 at 5:45:32 PM UTC-7 [email protected] wrote: > > Spring Migration is Underway > > Right this moment spring migration for North American land birds is well > underway starting from South and Central America. Some of these migrants > will just gradually move north, then use the Panamanian Isthmus follow the > topographic features of Central America then entering North America. > > Eastern oriented birds are apt to take a long distance route over the > Caribbean Sea before entering North America. At that time of year the > prevailing winds are from the southeast, giving those migrants an added > boost. Depending upon weather conditions their migration can be very > exciting for bird watchers. > > Since there are few visible land features to guide them over the ocean > migrating birds will rely on celestial cues, such as the sun and stars. In > the northern hemisphere, the sun lies in the south and moves during the day > from east to west, and at night the stars rotate counter-clockwise. (In the > southern hemisphere, it is all reversed). For course direction they will > rely on the degree of geomagnetic pull for re-orienting their course. Some > of the over-the-ocean migrants will enter North America via the > southeastern states and then move north, but most of the migrants will > enter the country via the Gulf Coast states and then branch out in all > directions north. Some like the Dickcissels will drift to Colorado for > nesting. Many of Colorado’s nesting birds winter in Central America so > their migration north in spring is shorter and is less dynamic, but equally > as welcomed. > > 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] For more options, visit this group at http://groups.google.com/group/cobirds?hl=en?hl=en * All posts should be signed with the poster's full name and city. Include bird species and location in the subject line when appropriate --- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/cobirds/3f26db8b-ee7d-42f9-9b84-0e5920418f9cn%40googlegroups.com.
