Because the newborn fish are large compared to the fry of oviparous fish, they are easier to feed than the fry of egg-laying species such as characins and cichlids.

Most reptiles are oviparous ( egg-laying ), although certain species of squamates retain the eggs until hatching and a few are viviparous ( give birth to live young ).

A literal answer is somewhat obvious, as egg-laying species pre-date the existence of chickens.

The gonoduct appears differently depending on whether the species is live-bearing or egg-laying.

It literally injects itself into a crab of a suitable species and by complex processes converts itself into an egg-laying bag.

The egg-laying monotremes are known from fossils of the Cretaceous and Cenozoic periods ; they are represented today by the platypus and several species of echidna.

Despite the small size of the group, it includes both egg-laying species and some that give birth to live young.

The group includes both egg-laying and viviparous species, with the latter being more common in species living at high elevations.

The family includes both egg-laying and ovoviviparous species.

The group includes both egg-laying and viviparous species.

Clutch size is one, with most species producing several clutches per year, and some utilizing communal egg-laying sites.

Ecologically, the system of multiple hosts protects host species from a critical reduction in numbers, and maximises the egg-laying capacity of the population of cuckoos.

Among the oviparous ( egg-laying ) pit vipers are Lachesis, Calloselasma, and some Trimeresurus species.

Steropodon galmani was a prehistoric species of monotreme, or egg-laying mammal, that lived during the middle Albian stage, in the Lower Cretaceous period.

Teinolophos trusleri was a prehistoric species of monotreme, or egg-laying mammal.

The name of the species is derived from its ability to give birth to live young, an adaptation to a cool climate, but some southern populations are oviparous ( egg-laying ).

Their icterid hosts breed colonially, and defend their nests vigorously, so even a large, bold and aggressive species like the Giant Cowbird has to cover an extensive territory to find sufficient egg-laying opportunities.

It climbs here ( unlike almost all other species of dragonflies ) upside down on the stem down and stabs the eggs with the egg-laying apparatus ( ovipositor ) almost vertically into the stems.

The method of egg-laying on the leaf varies between species.

Amphibians, reptiles, and birds use the same orifice for excreting liquid and solid wastes, and for copulation and egg-laying ; this orifice is known as the cloaca.

Fertilized eggs get two sets of chromosomes ( one from each parent's respective gametes ), and so develop into diploid females, while unfertilized eggs only contain one set ( from the mother ), and so develop into haploid males ; the act of fertilization is under the voluntary control of the egg-laying female.

Development is usually oviparous ( egg-laying ) but can be ovoviviparous, or viviparous.

Among animals using venom are spiders ( see spider bite ) and centipedes, which also inject venom through fangs ; scorpions and stinging insects, which inject venom with a sting ( which, in insects such as bees and wasps, is a modified egg-laying device – the ovipositor ).

After 12 months of laying, the commercial hen's egg-laying ability starts to decline to the point where the flock is unviable.

However, in virtually all stinging hymenopterans, the ovipositor is no longer used for egg-laying.

A butterfly's sense of taste, 200 times stronger than humans, is coordinated by chemoreceptors on the tarsi, or feet, which work only on contact, and are used to determine whether an egg-laying insect's offspring will be able to feed on a leaf before eggs are laid on it.

The Platypus — a venomous, egg-laying, duck-billed amphibious mammal — is considered to be one of the strangest creatures in the animal kingdom.

Rhubarb is a host, damage being visible mainly on the leaves and stalks, with gummosis and oval or circular feeding and / or egg-laying sites.

Mating and egg-laying time is variable depending on the locality and can be January and September, though is usually in March or later.

In marsupials and placental mammals, the uterus becomes lined by an endometrium, and is more developed than in egg-laying amniotes.

Beak trimming is most common in egg-laying strains of chickens.

A killifish is any of various oviparous ( egg-laying ) cyprinodontiform fish ( including families Aplocheilidae, Cyprinodontidae, Fundulidae, Nothobranchiidae, Profundulidae, Rivulidae and Valenciidae ).

It is a prime location for viewing birds and bird migrations, diamondback turtle egg-laying and horseshoe crab mating and egg laying.

Although they were reptiles and descended from egg-laying ancestors, viviparity is not as unexpected as it first appears.

A thick tail is generally a sign of good health, although lack of thickness may indicate recent egg-laying.

The only omitted extant mammal group is the egg-laying monotremes.

These include egg-laying, ovoviviparity, and true vivipary where the mother is connected to the developing embryos via a placenta-like structure.

Diapause is affected by photoperiod on the egg-laying adults or can be genetically determined.

Flies, searching for an egg-laying site are attracted by faecal odors coming from the vent pipe, but they are prevented from entering by the flyscreen at the outlet of the vent pipe.

The mating pair is together the majority of the time at the prime of egg-laying season, and usually stays close to the nesting site.

The secretions of workers in queenright colonies are long-chain alkanes with odd numbers of carbon atoms, but those of egg-laying queens and egg-laying workers of queenless colonies also include long chain esters.