Definition that contains hatchling
- passerine perching birds mostly small and living near the ground with feet having 4 toes arranged to allow for gripping the perch; most are songbirds; hatchlings are helpless
- passeriform bird perching birds mostly small and living near the ground with feet having 4 toes arranged to allow for gripping the perch; most are songbirds; hatchlings are helpless
- precocial (of hatchlings) covered with down and having eyes open; capable of leaving the nest within a few days
- altricial (of hatchlings) naked and blind and dependent on parents for food