**Khurram Wadee ✅** @mkwadee · 2018-03-02T15:50:49Z

Khurram Wadee ✅ @mkwadee

Khurram Wadee ✅ @mkwadee

Two become one: two #raven lineages merge in #speciation reversal | #Science | The Guardian

https://www.theguardian.com/science/2018/mar/02/two-become-one-two-raven-lineages-merge-in-speciation-reversal

#Zoology #Biology #Ornithology #Evolution

Mar 02, 2018, 15:50 · Web · 1 · 1

**varx (is elsewhere now)** @varx@i.write.codethat.sucks · Mar 25, 2018, 17:14

**varx (is elsewhere now)** @varx@i.write.codethat.sucks · Mar 25, 2018, 17:14

@mkwadee “One of our biggest goals is to just have people aware of this process.”

It's *amazing* how unrelated the definition of species I learned in high school biology is from the use in practice. The closest we got, I think, were ring species.

Check out this article on the genomics of Citrus: https://www.nature.com/articles/nature25447

All the citrus varieties you know of are basically complicated mixtures of at least 5 different "species" in the genus Citrus.

**Khurram Wadee ✅** @mkwadee · Mar 25, 2018, 20:38

**Khurram Wadee ✅** @mkwadee · Mar 25, 2018, 20:38

@varx The problem of finding a definition of species goes right back to #Darwin. He acknowledged that what some may call varieties, others might classify as species. This is an intrinsic problem of classification and taxonomy.