Species Spotlight

Species Spotlight: Chestnut-headed and Slaty-bellied Tesia

June 26, 2026 by Kai Pflug No Comments

For those who like their bird names to be messy, the Chestnut-headed Tesia is a good choice. Its scientific name is Cettia castaneocoronata rather than the expected Tesia castaneocoronata. So, what, why, and warum?

The Chestnut-headed Tesia was historically placed in the genus Tesia, along with other tiny, short-tailed babblers of the Himalayan and Southeast Asian undergrowth. Tesias are generally small, skulking ground warblers.

Then, DNA analysis showed that the species is actually closer to the bush warblers in the genus Cettia. But the common name Tesia stuck. And I guess the Chestnut-headed Tesia does not mind much.

Nor does eBird, warmly describing the species as an “adorably round and tailless small ground-dweller”. The HBW adds that it “rarely flies”.

The Slaty-bellied Tesia has a similar shape and size but is a proper Tesia species.

eBird likes this species as well, calling it a “charming tiny bird, brightly-colored but difficult to see”.

The HBW adds a somewhat contradictory sounding “Active but extremely skulking, although often inquisitive and seemingly not shy.”

To me, it looks exactly the same as the Gray-bellied Tesia, a fact that eBird first seems to admit, only to retract a moment later: “The very similar Gray-bellied Tesia has a paler belly, a distinct yellowish eyebrow, and a darker greenish crown” (I am now immediately suspicious if several minor distinctions such as “paler” or “darker” are needed to visually separate species).

Both species were seen at Baihualing, Yunnan, China, in March 2026.

Written by Kai Pflug
Kai has lived in Shanghai for 22 years. He only started birding after moving to China, so he is far more familiar with Chinese birds than the ones back in his native Germany. As a birder, he considers himself strictly average and tries to make up for it with photography, which he shares on a separate website. Alas, most of the photos are pretty average as well. He hopes that few clients of his consulting firm—focused on China’s chemical industry—ever find this blog, as it might raise questions about his professional priorities. Much of his time is spent either editing posts for 10,000 Birds or cleaning the litter boxes of his numerous indoor cats. He occasionally considers writing a piece comparing the two activities.