Discovering Birds' Cool Spots in Savanna Trees: A Climate Change Perspective

Imagine you're a small bulbul or a larger hornbill, both birds living in a subtropical African savanna. You love to rest in trees, especially when it's hot. Scientists have recently used special tools called LiDAR and complex models to figure out how many trees provide a cool place to rest. They found that currently, about one-third of these trees offer a temperature below 42°C, which is comfortable for both birds. These scientists created models to predict how climate change might affect these cool spots. They used a scenario where greenhouse gases keep increasing. By the end of this century, the number of trees providing cool spots could drop dramatically. For bulbuls, it might be as low as 0. 4%, and for hornbills, around 3. 8%. This means that the birds might have to look much harder to find a cool place to rest.

The scientists also looked at how many days it would be too hot for the birds to rest comfortably. Right now, almost all trees (98-99%) have less than 10 days a summer where it's too hot. By the end of the century, this could drop to just 3% for bulbuls and 24% for hornbills. This shows us how much climate change could affect birds living in savanna landscapes. It's a big problem if they can't find cool places to rest.

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