A recent study published in the journal Nature Ecology & Evolution reveals that extreme heat events driven by climate change have caused a 25–38% average decline in tropical bird populations since 1950. This decline is attributed not only to deforestation but also to increased heat extremes, which threaten bird species even in intact forests. Additionally, separate research on Australian birds, including kookaburras, magpies, and lorikeets, has identified an unexpected phenomenon of sex reversal, where approximately 6% of birds exhibited chromosomes of one sex but reproductive organs of another. These findings highlight the multifaceted impacts of environmental stressors such as climate change and pollution on avian species.