Variable Limestone Babbler

The variable limestone babbler (Gypsophila crispifrons) is a species of bird in the family Pellorneidae. It is found in the limestone hills of northern and eastern Thailand northwest to southern Myanmar. Two other Gypsophila species, the Annam limestone babbler (G. annamensis) and the rufous limestone babbler (G. calcicola) were previously considered subspecies of G. crispifrons, but a 2020 study found them to be distinct species. (Wikipedia, general species account).

Babblers and their close allies are generally active passerines of forest, scrub or undergrowth. Many travel in pairs, family parties or mixed-species flocks while searching foliage, bark and leaf litter for invertebrates, sometimes adding fruit or seeds. Voice and social behaviour are often useful identification clues. These are family-level notes rather than Vietnam-specific breeding measurements (general babbler ecology). Regional observations can refine these broad expectations.