pea·cock 
(pēkŏk′)
(pēkŏk′)n.
1.
a. A male peafowl, distinguished by its crested head, brilliant blue or green plumage, and long modified back feathers that are marked with iridescent eyelike spots and that can be spread in a fanlike form.
b. A peafowl, either male or female.
2. A vain or ostentatious person.
intr.v. pea·cocked, pea·cock·ing, pea·cocks
To strut about like a peacock; exhibit oneself vainly.
[Middle English pocock, pecok : po, peacock (from Old English pawa, pēa, peafowl, from Latin pāvō, peacock) + Middle English cok; see COCK1.]
peacock′ish, peacock′y adj.
peacockpeacock displaying
Pavo cristatus