To hold one's cards close to the chest. / To avoid revealing information.

Melaniparus pallidiventris, a small bird of the tit family Paridae

Melaniparus fasciiventer, a small bird of the tit family Paridae

A type of sandpiper, (Calidris subruficollis)

(figuratively) To ostentatiously display remorse, sorrow, or upset.

Ficedula parva, an Old World flycatcher breeding in eastern Europe and across Central Asia.

Emberiza aureola, a passerine bird in the bunting family Emberizidae.

Pheucticus ludovicianus, a large, seed-eating grosbeak in the cardinal family (Cardinalidae).

Branta ruficollis, a species of goose from Eurasia, with a large rust-colored area on its breast and throat.

Third-person singular simple present indicative form of make a clean breast