Approx 25-30 days sooner than about a century ago. Ties to climate change as plants growing earlier and the insects (eaten by birds) are similarly appearing sooner.
Interestingly, birds with small brains are getting noticeably smaller (to deal with climate change?) but birds with larger brains are not experiencing the same level of size reduction.
Direct connection to macro areas in terms of food growth, planting, harvesting, growing seasons, and the steady movement of warmer/wetter weather from the equator toward both poles (north and south).
Approx 25-30 days sooner than about a century ago. Ties to climate change as plants growing earlier and the insects (eaten by birds) are similarly appearing sooner.
Makes sense.
Warmer springs mean more offspring for prothonotary warblers www.sciencedaily.com/releases/2020/12/201209124917.htm
Climate change contributes to gradually warming Aprils in southern Illinois, and at least one migratory bird species, the prothonotary warbler, is taking advantage of the heat. A new study analyzing 20 years of data found that the warblers start their egg-laying in southern Illinois significantly earlier in warmer springs. This increases the chances that the birds can raise two broods of offspring during the nesting season, researchers found.
Breeding earlier in warmer years with no apparent cost to reproduction has been documented in many other migratory bird species including reed warblers, tree swallows, purple martins and black-throated blue warblers.