Mammals that have evolved more developed brains tend to have a smaller size difference between males and females of that species, according to new research. In many mammal species, the males can be ...

In the mice with large-brain primate microbes, the researchers found increased expression of genes associated with energy ...

New research has revealed that birds, reptiles, and mammals have developed complex brain circuits independently, despite sharing a common ancestor. These findings challenge the traditional view of ...

Why do cats generally live longer than dogs? New research suggests that longer livespans of mammals like cats could be linked to their bigger brains and more complex immune systems. An international ...

Size matters. Thomas Huxley found that mammalian brains are broadly equivalent in structure and differ primarily in size. Even within our own species, there is some evidence that people with larger ...

Brain scans of more than 100 mammalian species, including humans, reveal that the efficiency of information transfer in the brain is the same in all mammals, regardless of size. Brain connectivity is ...

Scientists use digital casts of the interior of mammalian skulls to learn about brain evolution. They find that the relatively large size of mammalian brains was driven by an excellent sense of smell.

In many mammal species, the males can be bigger than the females (or vice versa), a trait called sexual size dimorphism (SSD). For example, male elephant seals are around three times bigger than ...

Since we get beaten by large mammals in the first scheme and small mammals in the second, a third scheme has been devised that takes into account that as mammals get larger, brains get absolutely ...