do robins have more than one set of eggs per year
American robin The American robin begins to breed shortly after returning to its summer range. It is one of the first North American bird species to lay eggs, and normally has two to three broods per breeding season, which lasts from April to July.[12]
Great blue heron Although nests are often reused for many years and herons are socially monogamous within a single breeding season, individuals usually choose new mates each year.[28] Males arrive at colonies first and settle on nests, where they court females; most males choose a different nest each year.[28] Great blue herons build a bulky stick nest. Nests are usually around 50 cm (20 in) across when first constructed, but can grow to more than 120 cm (47 in) in width and 90 cm (35 in) deep with repeated use and additional construction.[29] If the nest is abandoned or destroyed, the female may lay a replacement clutch. Reproduction is negatively affected by human disturbance, particularly during the beginning of nesting. Repeated human intrusion into nesting areas often results in nest failure, with abandonment of eggs or chicks. However, Vancouver B.C. Canada's Stanley Park has had a healthy colony for some years right near its main entrance and tennis courts adjacent to English Bay and not far from Lost Lagoon.[30] The park's colony has had as many as 183 nests.[31]