This maintains the heat transfer between steam and liquid to a maximum. Figure 3 shows a temperature profile when saturated steam is used. The difference with the previous diagram is that there is now a layer of condensate on the heating surface and steam temperature is constant.
As a general rule Owls are monogamous - pairs are comprised of one male and one female, neither one of which has any involvement with other nesting birds. With some Owl species the pair bonds last only for the duration of the breeding season, especially if the species involved is dispersive or migratory.
In February to April, females lay 1-3 eggs with an incubation period of 28 to 40 days. Black Vultures are thought to mate for life, whereas Turkey Vultures form established pairs only to raise young during the breeding season.Vultures are migratory, social birds that form large communal roosts.wo species of vulture can be observed in Fairfax County: Black vultures (Coragyps atratus) and Turkey vultures (Cathartes aura). Black vultures are 22 to 27 inches long with a 4.5 to 5 foot wingspan, and weigh 4 to 5 lbs.