Aging has been described as the predominant cause of vertical ridges on the fingernails. Onychorrhexis is the medical term used to describe longitudinal ridges on the nails that often accompany brittle nails. In contrast to longitudinal ridges, Beau's lines are horizontal or transverse depressions in the nail that may be confused with nail ridging.
Ruby-throated Hummingbird Migration. Ruby-throated Hummingbirds normally spend the winter in Central America. From March through May they migrate north, some through the eastern two thirds of Texas, some apparently through Cuba and Florida, and some apparently directly across the Gulf of Mexico. Birds reach the southern Gulf coast in late February and early March.
Few hummingbirds leave the nest before they are three weeks old. Nesting periods of 20 to 25 days are not uncommon. Inclement weather or harsh environmental conditions may prolong the date of fledging.Andean Hillstars from high in the mountains fledge after 30 to 40 days.ew hummingbirds leave the nest before they are three weeks old. Nesting periods of 20 to 25 days are not uncommon. Inclement weather or harsh environmental conditions may prolong the date of fledging.