Microorganisms, Bacteria and Viruses. Microbiological contamination of water has long been a concern to the public. From the 1920's-1960's, the bacillus which causes typhoid fever was considered a major problem in the water supply (1). Once it was eradicated, new microbes were present to take its place.
How long does a mourning dove sit on her eggs for them to hatch? Robins keep the clutch cool before the last egg is laid so the nestlings all hatch at approximately the same time. Incubating is done mainly by the female, who rarely leaves her clutch for more than a few minutes at a time.
I have a Robin that recently laid 4 blue eggs that have hatched. The nest is right outside of my back door in a tall bush. We are very excited about this nest. The nest has been in this location since last year. The Robin laid 3 blue eggs last year. Those eggs did not hatch she moved two of the eggs and left one which eventually turned grey. However, the nest remained in the same place. The Robin used the same nest this year by adding more straw, etc. to the old nest.