A Bird Japan Knew for 100 Years Was Secretly Two All Along

A familiar Japanese warbler turned out to be two separate species, split apart for nearly 3 million years.

The Tokara Leaf Warbler is Japan's first newly described bird species since 1982.

The two birds look almost identical — DNA and song, not appearance, gave it away.

Both species have low genetic diversity and are recommended for Vulnerable status.

It shows how many hidden species may still be uncounted during a global biodiversity crisis.