Red-tailed Hawks are monogamous and usually stick together for life. If something happens to the one of the hawks, the surviving bird will usually find another mate.
March 6th was the first time we saw this pair of hawks mating. Mating in birds is sometimes referred to as the "cloacal kiss." Males and females will rub their cloacas together for a few moments to transfer the male's sperm to the female. Copulation lasts about 15 seconds.
Outside of the mating process, we would often spot the male and female sitting in close proximity to each other and often on the same branch.