Mass extinctions of land-dwelling animals occur in 27-million-year cycle

Mass extinctions of land-dwelling animals—including amphibians, reptiles, mammals, and birds—follow a cycle of about 27 million years, coinciding with previously reported mass extinctions of ocean life, according to a new analysis published in the journal Historical Biology.

source https://phys.org/news/2020-12-mass-extinctions-land-dwelling-animals-million-year.html