Birds' blood functions as heating system in winter
This article is over 5 years old, and the information may therefore be outdated. Researchers at Lund University in Sweden have discovered that bird blood produces more heat in winter, when it is colder, than in autumn. The secret lies in the energy factories of cells, the mitochondria. Mammals have no mitochondria in their red blood cells, but birds do, and according to the research team from Lund
https://www.science.lu.se/article/birds-blood-functions-heating-system-winter - 2026-05-09
