broody

Of birds: sitting persistently and protectively on a nest, in order to hatch eggs.

a broody hen

Of any creature or person: showing an interest in raising young.

“Clayton's getting so broody. This might help put things into perspective for him. I want a family, but I need to establish my career first." "I'm not in a rush," Clayton countered. "You practically teared up at the sight of Serena's tiny socks the other day. You've got baby fever bad."

Brooding, dwelling upon one's thoughts; moody.

Then, with unshorn beard and matted hair tangled with straw, his clothes smeared with slime of obscene things which are begotten of damp and darkness, his thoughts broody with wrath and revenge, Kynon was marched through the streets[…]

He didn't even give me one of his broody looks that gave nothing away about his thoughts at all (except the fact he was broody). He gave me a look I'd never seen on him before. A remorseful one.

Gloomy.

Broody clouds hung low against the water. None of this bothered the jBoat sailors, whose nimble craft challenged devilish winds and currents. A pod of twenty-two footers raced and frolicked like ten-year-olds on skateboards.

The contrast between broody clouds and condensed sky was startling. Fenn stepped off the path into rough grass to get near one of the church windows and, cupping a hand between brow and glass, peered in. There was an unappealing gloom[…]

A female bird in the condition to incubate eggs; a broody hen, duck, etc.

There are six broodies in that coop.