These birds are noted for their playful antics, for example perching on shoulders or heads, and a few also have a mischievous streak – like playfully tugging at hair or knocking off hats. Agree with Jimi that the most acceptable antonym for "free of demand" is "for sale." But, https://parrots-for-adoption39493.bloggosite.com/43956190/details-fiction-and-talking-parrots-for-adoption