The cuckoo is a notorious brood parasite that lays its eggs in other birds' nests.

Field biologists recorded several brood nests tucked beneath the reeds along the riverbank.

The beekeeper inspected the brood nest to check for signs of disease.

The biologist measured the brood size of the coastal gulls to study their reproductive success.

Researchers compared brood sizes across different habitats to understand parental investment.

The male seahorse carried the fertilized eggs in his brood pouch until the fry were ready to be released.

During the mating season, male seahorses inflate their brood pouches to protect the developing embryos.

The farm scheduled vaccinations for the brood mares before the breeding season.

Many songbird species struggle to raise their young when brood parasites target their nests each breeding season.

The brood sow guarded her piglets closely after giving birth.