What is the meaning of Yellowhead?

A yellowhead butterflyfish (Chaetodon xanthocephalus).

A yellowheaded jawfish (Opistognathus aurifrons).

A plant of some species of genus Inula of the daisy family.

A plant in genus Trichoptilium, in the daisy family.

A plant of species Zanthoxylum flavum, related to citrus.

A pimple or pustule without a blackhead.

A mohua (Mohoua ochrocephala), a bird of New Zealand.

Source: wiktionary.org