The Paleocene and Eocene epochs were crucial periods for the evolution of early mammals, particularly the ancestors of modern primates. During this time, a group of mammals known as ...

Based on mathematical modeling, the switch to singletons occurred early on, at least 50 million years ago. From there, many primate lineages, including ours, evolved to have increasingly larger ...

Maternal stress hormone levels during early pregnancy can have a lasting effect on the stress system of the offspring. The results of a long-term study on wild Assamese macaques in Thailand indicate ...

Maternal stress hormone levels during early pregnancy can have a lasting effect on the stress system of the offspring. The ...

For primates, and especially humans, childhood learning is crucial. We propose that the switch from twins to singletons was critical for the evolution of large human babies with large brains that were ...