What's interesting is that the video talks about how birds like tree swallows are nesting 9 days earlier than previous records indicate. I always thought that bird migration was more influenced by how long daylight lasts as opposed to weather. If daylight is the case, then they would be nesting at about the same time, right? Unless these are southern tree swallows that tend to be more resident and more apt to nest early.
Speaking of nesting, while writing on the futon today, I noticed a robin lurking in the neighborhood and by this evening, he was singing outside of our apartment. I wonder if he will be our resident robin this spring?