A group of robins is commonly called a Blush. Other collective nouns you may see include Bobbin and Breast.
A collective noun for robins is a "colony." This term refers to a group of these popular and small songbirds that commonly gather and band together during various seasons. Typically known for their vibrant red breasts and melodious morning songs, robins tend to form colonies predominantly in spring and summer. During these times, they can often be spotted in large numbers donning a captivating sight among trees or in fields and gardens. These colonies enable robins to engage in social behaviors such as foraging together for insects, worms, and berries, as well as protecting their territories and the nests of their offspring. The synchronized movements and singing of a robin colony can create a harmonious symphony that adds charm and vitality to the surrounding environment. The presence of a robin colony often indicates a thriving and balanced ecosystem, gratitude for the abundance provided by favourable habitats, and an ensemble of artistic feathers in flight.
Known collective nouns for Robins include: