For the US Birds

The phenomenon has already been noted in European birds. Scientists, using data on 72 species for which historical and modern data exist in Chicago records, have now confirmed that some US birds are laying their eggs much earlier (https://www.theguardian.com/environment/2022/mar/25/birds-nesting-laying-eggs-early-climate-crisis-study). The Chicago study found that one third of the species (including Blue jays, Yellow warblers and Field sparrows), were currently nesting much earlier in the year. Species showing this phenomenon, were an average of 25 days earlier, than was the case 100 years ago. This is yet another clear illustration of the consequences of human-mediated global heating. Disrupting natural cycles to such large extents, is a threat to the survival of species and biological communities.