What does brooded mean in drawing horses

noun

a number of young produced or hatched at one time; a family of offspring or young.

a breed, species, group, or kind:

The museum exhibited a brood of monumental sculptures.

verb (used with object)

to sit upon (eggs) to hatch, as a bird; incubate.

(of a bird) to warm, protect, or cover (young) with the wings or body.

to think or worry persistently or moodily about; ponder:

He brooded the problem.

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verb (used without object)

to sit upon eggs to be hatched, as a bird.

to dwell on a subject or to meditate with morbid persistence (usually followed by over or on).

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