Earth in the past has had periods of global warm weather, abundant oxygen in the air, creating conditions for species to grow suddenly.
A team of researchers has discovered fossils of an ancient spider that dates back to 305 million years in France.
German scientists found the body of an ancient spider covered with sap and died while mating with females.
With the most advanced imaging technology, European scientists have obtained unexpected holograms of fossil spider samples 49 million years ago trapped in amber.