What do most animals lay?

All the rest lay eggs. How, then, do scientists conclude that 99 percent of the world's animals lay eggs? Because most of the millions of species of animals on earth are insects, and most of them lay eggs.

1. Do all animals lay eggs?
2. What are animals that lay eggs called?
3. Do mammals lay eggs?
4. What animals dont lay eggs?
5. What are the 5 mammals that lay eggs?
6. Does frog lay egg?
7. What are the 3 mammals that lay eggs?
8. Is a penguin a mammal?
9. Are fish born alive or hatched?
10. Do sharks give live birth?
11. Do dolphins lay eggs?
12. How do platypus exist?
13. What animal is not born alive?
14. What is the first mammal?

Do all animals lay eggs?

Not all animals that lay eggs lay them in nests. ... Birds and fish are not the only animals that lay eggs. Insects, turtles, lizards, and reptiles lay eggs, too. Only two mammals lay eggs: the platypus and the echidna.

What are animals that lay eggs called?

Use the adjective oviparous to describe an animal that lays eggs. Birds and lizards are oviparous. A chicken is a good example of an oviparous animal, since females lay eggs and then keep them warm and safe until they hatch. In fact, all birds are oviparous, as are most fish, reptiles, and insects.

Do mammals lay eggs?

Only two kinds of egg-laying mammals are left on the planet today—the duck-billed platypus and the echidna, or spiny anteater.

What animals dont lay eggs?

Birds, insects, reptiles and fishes are oviparous animals. Animals which reproduce by giving birth to their young ones are called viviparous animals. These animals do not lay eggs. Mammals like cat, dog and man are viviparous animals.

What are the 5 mammals that lay eggs?

Only five species of animals share this extraordinary egg-laying trait: the duck-billed platypus, western long-beaked echidna, eastern long-beaked echidna, short-beaked echidna, and Sir David's long-beaked echidna. All of these monotremes are only found in either Australia or New Guinea.

Does frog lay egg?

Most frogs and toads begin life as eggs floating in the water. A female may release up to 30,000 eggs at once. Each species of toad and frog lays eggs at different times. ... Frogs lay them in clusters, or large globs.

What are the 3 mammals that lay eggs?

These three groups are monotremes, marsupials, and the largest group, placental mammals. Monotremes are mammals that lay eggs. The only monotremes that are alive today are the spiny anteater, or echidna, and the platypus. They live in Australia, Tasmania, and New Guinea.

Is a penguin a mammal?

Penguins, or Sphenisciformes, are not mammals, but birds. They are different from mammals in that they have feathers instead of hair or fur, and unlike most mammals penguins lay eggs instead of giving live birth. ... Unlike mammals, penguins lay eggs rather than giving live birth.

Are fish born alive or hatched?

Fish Reproduction: The eggs of fish are fertilized either externally or internally, depending on species. The female usually lays the eggs, and the embryos in the eggs develop and hatch outside her body. ... Each embryo develops in its own egg. The young are 'born alive' like most mammals.

Do sharks give live birth?

There are over 500 species of shark living in waters around the world and the majority give birth to live young. The remainder are oviparous, meaning they lay eggs. ... Among them are egg layers such as the small-spotted catshark (Scyliorhinus canicula) and nursehound (Scyliorhinus stellaris).

Do dolphins lay eggs?

Like every mammal, dolphins are warm blooded. ... Other characteristics of dolphins that make them mammals rather than fish are that they give birth to live young rather than laying eggs and they feed their young with milk. Also, like all mammals, dolphins even have a tiny amount of hair, right around the blowhole.

How do platypus exist?

The platypus, found only in Australia is one of the five mammal species of that lay eggs instead of giving birth to live young. The reason that odd, egg-laying mammals still exist today may be because their ancestors took to the water, scientists now suggest. ...

What animal is not born alive?

Only birds, turtles, and crocodilians bear no live young at all.

What is the first mammal?

The earliest known mammals were the morganucodontids, tiny shrew-size creatures that lived in the shadows of the dinosaurs 210 million years ago. They were one of several different mammal lineages that emerged around that time. All living mammals today, including us, descend from the one line that survived.