It has been a generational tradition for nearly 20 years. Learning as babies, they return as adults the following year.
In turn, they teach their babies.
How many return every year varies. It depends upon the usual factor in nature, the ability to survive. A few that have visited this spring and summer have been doing so the past 3-5 years. You know them by having observed individual physical traits belonging to a robin. When a given robin that has returned so often does not the next spring, it is a little bittersweet in not seeing them. Yet, seeing a new generation of robins says the circle of life is strong. And, nature continues to be strong.
This summer, we played “host” to 7-8 baby robins. We eagerly await their return next spring.