What animals have external development?

Among vertebrates, external fertilization is most common in amphibians and fish. Invertebrates utilizing external fertilization are mostly benthic, sessile, or both, including animals such as coral, sea anemones, and tube-dwelling polychaetes.

1. What animals undergo external fertilization?
2. Do most animals have internal or external development?
3. Do birds have external development?
4. Do reptiles have external development?
5. What are the examples of animals that undergo external and internal fertilization?
6. Does frog undergo external fertilization?
7. Do reptiles have internal or external fertilization?
8. Do fish have internal or external fertilization?
9. Is Dog internal or external fertilization?
10. Do reptiles have indirect development?
11. Do chickens have internal or external fertilization?
12. Is fertilization in mammals internal or external?
13. Are bird eggs fertilized externally?
14. Do amphibians have external fertilization?
15. Do sharks practice internal fertilization?
16. Is most common among terrestrial animals?

What animals undergo external fertilization?

Most fish, bivalves (like clams), and crustaceans, like this peacock mantis shrimp, use external fertilization.

Do most animals have internal or external development?

Internal fertilization occurs most often in land-based animals, although some aquatic animals also use this method. ... In ovoviparity, fertilized eggs are retained in the female, but the embryo obtains its nourishment from the egg's yolk; the young are fully developed when they are hatched.

Do birds have external development?

Birds reproduce by internal fertilization, during which the egg is fertilized inside the female. Like reptiles, birds have cloaca, or a single exit and entrance for sperm, eggs, and waste. The male brings his sperm to the female cloaca. ... Then the hard-shelled egg develops within the female.

Do reptiles have external development?

Most reptiles reproduce sexually and have internal fertilization. Reptile eggs are amniotic, so they can be laid on land instead of in water. Reptiles do not have a larval stage, and their hatchlings are relatively mature. Reptile parents provide little if any care to their young.

What are the examples of animals that undergo external and internal fertilization?

This occurs in some bony fish (like the guppy Lebistes reticulatus), some sharks, some lizards, some snakes (such as the garter snake Thamnophis sirtalis), some vipers, and some invertebrate animals (like the Madagascar hissing cockroach Gromphadorhina portentosa).

Does frog undergo external fertilization?

In most species of frogs, fertilization is external. The male frog grabs the female's back and fertilizes the eggs as the female frog releases them (Figure 2.2B). ... The sperm and egg die quickly unless fertilization occurs.

Do reptiles have internal or external fertilization?

Most reptiles reproduce sexually and have internal fertilization. Males have one or two penises that pass sperm from their cloaca to the cloaca of a female. Fertilization occurs within the cloaca, and fertilized eggs leave the female's body through the opening in the cloaca.

Do fish have internal or external fertilization?

In most fish species, fertilization takes place externally. These fish are oviparous. Eggs are laid and embryos develop outside the mother's body. In a minority of fish, including sharks, eggs develop inside the mother's body but without nourishment from the mother.

Is Dog internal or external fertilization?

When we think about organisms mating, often we think of animals around us—humans, dogs, dragonflies, cats, lizards, or maybe birds. When these animals mate with each other, the egg and sperm meet inside the body, not outside in the air or water.

Do reptiles have indirect development?

Reptiles, birds and mammals tend to experience direct development.

Do chickens have internal or external fertilization?

Chickens — like other birds — lay fertilized eggs via sexual reproduction.

Is fertilization in mammals internal or external?

In mammals, fertilization takes place internally in the protected environment of the ampulla of the oviduct, as opposed to external fertilization where sperm and egg meet outside the parent's body (e.g., as in fish, reptiles, amphibians and invertebrates).

Are bird eggs fertilized externally?

Birds reproduce by internal fertilization, during which the egg is fertilized inside the female. Like reptiles, birds have cloaca, or a single exit and entrance for sperm, eggs, and waste. The male brings his sperm to the female cloaca. The sperm fertilizes the egg.

Do amphibians have external fertilization?

Amphibians reproduce sexually with either external or internal fertilization. Amphibians may attract mates with calls or scents. Amphibians do not produce amniotic eggs, so they must reproduce in water. Amphibian larvae go through metamorphosis to change into the adult form.

Do sharks practice internal fertilization?

Shark and batoid eggs are fertilized internally, as opposed to external fertilization in many bony fishes. Internal fertilization is a key adaptation for energy-intensive reproduction. When born or hatched, young sharks are fully formed and physically able to fend for themselves.

Is most common among terrestrial animals?

Arthropods (such as flies) are the most abundant terrestrial animals by species count.