Outside my mother's side door is a thick clematis vine on a metal trellis. Inside the vine is a cardinal nest with 7 eggs. She thought it was unusual that there were so many eggs and so many cardinals around the yard since they are territorial so she watched carefully and discovered that there were two females in the vine at one time. They both must have laid eggs in this nest but it is very hard to see through the vine to see if they are taking turns incubating or not. Both males are around as well so it is quite interesting when we are in the back yard although we try to disturb them as little as possible.
Has anyone seen this behavior before? What do you think about their chances of success?