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The barn swallows wintering in southern Africa are from across Eurasia to at least 91°E, [21] and have been recorded as covering up to 11,660 km (7,250 mi) on their annual migration. [22] The nominate European subspecies was the first to have its genome sequenced and published.
A 2011 study projected that the frequency and magnitude of both maximum and minimum temperatures would increase significantly as a result of global warming. [13] According to the Fifth National Climate Assessment published in 2023, coastal states including California, Florida, Louisiana, and Texas are experiencing "more significant storms and extreme swings in precipitation".
Welcome swallows are good indicators of temperature, as the temperature drops lower, the less likely a swallow will be observed in the South. When swallows are around, the temperature usually does not drop below -2/-3 degree Celsius. [7] Migration may occur during non-breeding seasons for larger more reliable food sources.
Despite worsening drought conditions, global warming has already doubled the odds that California will experience a catastrophic 'megaflood.' Risk of catastrophic California 'megaflood' has ...
Climate change has raised the temperature of the Earth by about 1.1 °C (2.0 °F) since the Industrial Revolution.As the extent of future greenhouse gas emissions and mitigation actions determines the climate change scenario taken, warming may increase from present levels by less than 0.4 °C (0.72 °F) with rapid and comprehensive mitigation (the 1.5 °C (2.7 °F) Paris Agreement goal) to ...
Weight: 11–16 g (0.39–0.56 oz) (to 19.5 g (0.69 oz) before migration) The song is a continuous gravelly twittering when the birds are on the wing and becomes a conversational undertone after they have settled in the roost. The harsh alarm is heard when a passing falcon, crow or other suspected predator requires combined action to drive it away
Climate Central’s “2023 Winter Package” graphic shows the average change in winter temperature between December and February, from 1970 to 2022.
Most hummingbirds migrate in the winter to Central America or Mexico, but some hummingbirds spend the winter on the Gulf Coast and may be found in South Texas and South Louisiana during mild winters.