egglayers
Hens and ducks
Animals that reproduce by laying eggs rather than giving birth to live young.
The term covers birds, most reptiles, amphibians, fish, and insects, as well as the egg-laying mammals—platypuses and echidnas.
Egglayers dominated the dinosaur era.
The word is informal and descriptive rather than scientific.
Reproducing through external eggs
- fertilizationGamete fusion creating zygote
- ovulationEgg discharge from ovary
- embryoOrganism before birth
- yolkEgg's nutrient core
albumen · eggshell · oviposition · hatchling · spawn · zygote · gametes · ovum
Egg-laying flying vertebrates
- reptilesCold-blooded scaly vertebrates
- amphibiansVertebrates with aquatic larvae
- fishGilled aquatic vertebrate
- monotremesEgg-producing mammal order
platypus · echidna · chickens · turtles · frogs · snakes · lizards · crocodiles
oviparous
Reproducing through external eggs
- fertilizationGamete fusion creating zygote
- ovulationEgg discharge from ovary
- embryoOrganism before birth
yolk · albumen · eggshell · oviposition · hatchling · spawn · zygote · gametes · ovum · chorion
birds
Egg-laying flying vertebrates
- reptilesCold-blooded scaly vertebrates
- amphibiansVertebrates with aquatic larvae
- fishGilled aquatic vertebrate
monotremes · platypus · echidna · chickens · turtles · frogs · snakes · lizards · crocodiles · sharks
brood
Hatchlings as a group
- incubationDevelopment before emergence
- nestboxArtificial cavity for wildlife
- clutchMechanism linking engine to gearbox
roost · habitat · territory · down · straw · perch · fledge · chicks · brooding · insulation