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 ...

The idea of a species is fundamental to the way that many people understand the structure of life on Earth. But ask 10 specialists how they define the concept and you might get 10 answers. In this ...

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 ...

Taxonomy, or the naming of species, is surprisingly complicated – and contentious. It doesn't take much scientific expertise to divide lions from tigers, or pigeons from flamingos, but details count ...

de Queiroz, Kevin. 1998. "The General Lineage Concept of Species, Species Criteria, and the Process of Speciation." In Endless Forms: Species and Speciation. 57–75. Oxford University Press.

More than 50 years after Bob Paine’s experiment with starfish, hundreds of species have been pronounced “keystones” in their ecosystems. Has the powerful metaphor lost its mathematical meaning? Anne ...

More than 50 years after Bob Paine’s experiment with starfish, hundreds of species have been pronounced “keystones” in their ecosystems Lesley Evans Ogden, Quanta Magazine In the late 1960s, Bob Paine ...