After only 2 generations of breeding guppies (small fish) a scientist had increased the brain size by 9%. The big brain fish were also smarter. However, their guts were smaller and their fertility lower. https://www.nationalgeographic.com/science/article/scientists-breed-smarter-fish-but-reveal-the-costs-of-big-brains
Links for 2022-01-03
Links for 2022-01-03
Links for 2022-01-03
After only 2 generations of breeding guppies (small fish) a scientist had increased the brain size by 9%. The big brain fish were also smarter. However, their guts were smaller and their fertility lower. https://www.nationalgeographic.com/science/article/scientists-breed-smarter-fish-but-reveal-the-costs-of-big-brains