People often say that spring “bursts” forth. But this seasonal change isn’t like flipping a switch. It’s more like a series of waves breaking slowly. Robins and bluebirds return north in March. During April, more songbirds migrate north from the tropics, adding to spring’s growing chorus. As late as June, birds such as Willow Flycatchers and this Mourning Warbler arrive from South America. By this time, those early robins may be feeding their second brood. For them, spring has been bursting for over three months.

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