In recent years, experts have discovered more far-reaching effects of vitamin D deficiency. In 2009, researchers from the University of Missouri-Columbia found that insufficient levels of vitamin D are associated with inflammation, an immune system response that can cause fluid buildup and swelling.
1 of 19 Facebook Pinterest. Feeding birds comes naturally when you grow trees and shrubs with nutritious berries. The plants you'll find in this slideshow do double duty: They attract birds and create a beautiful display with their flowers, fall colors, and fruits adding sparkle to your landscape. 2 of 19 Facebook Pinterest.
How do birds mate? Which organs do the male bird use to mate? Do female birds have organs? Birds mate by joining at their cloaca so that the sperm of the male bird can go from his cloaca to the female's. Confused? Here's a quick overview on how birds reproduce, have sex or mate with some amateur pictures. Bird anatomy â The cloaca The cloaca is an opening in a bird's posterior that is used for excretion and reproduction.