Birds decrease in size as temperatures increase. Image by Dreamstime.
Birds around the world are shrinking due to increasing temperatures

Birds living in colder climate have generally larger bodies, in order to reduce heat loss. To understand better the variations in body size induced by changing temperatures, scientists studied the European house sparrows from Australia and New Zeeland. They looked for relationships between variations in size of the birds with the high summer temperatures. The conclusion was that the average adult body size was decreased, and this was strongly correlated with high temperatures. The study raises concerns that increasing global warming could decrease the body of birds, with a negative impact on their health.

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