The question of what defines a species has vexed scientists across the ages, particularly in conservation, where decisions require a firm understanding of biodiversity. When you purchase through links ...

A new photo of a long-forgotten flower showed up online. Identifying it means getting into the tricky question of how a species is defined. A population of lemon beebalm (Monarda citriodora) flowering ...

In the penultimate episode of Crash Course Zoology, we use everything we've learned so far to try and figure out what a "species" even is anyway! As you'll see, the incredible diversity of animals ...

The evolutionary biologist Jochen Wolf was working from home when we first spoke, in April, 2020. Germany was under lockdown, and his lab, at Ludwig Maximilian University, in Munich, had been closed ...