They do not feed at all through the developmental period, and can have over. May 31, 2008 must be a record for the most wrong answers. A few kinds of fish keep their eggs inside their bodies, so when they hatch they give birth to live young. Of the three, live birth is only seen in lepidosaurs. All mammals are warmblooded meaning that they have an internal body temperature regulation mechanisms. A female black bear will have a litter of 24 cubs about every 2 years. Monotremes are mammals that lay eggs instead of giving birth to live young. They start as eggs and go through stages until they turn into adult frogs. You wont find blue tongue lizards, solomon island lizards and shingleback lizards laying eggs. With only two exceptions, the echidna and the platypus, all mammals deliver live births. The scorpions eggs hatch while still inside her body, so by all appearances, she gives live birth. A few species give birth to live young, nourishing them with glandular secretions while they are in the oviduct. Most fish lay eggs, but there is exceptions to most rules. Amphibians give birth to eggs and so do most fish as well.
Now, this is exactly the reason why they lay their eggs in water. Does a scorpion lay eggs or does it give birth to its. And although scientists dont know exactly when the first live animal emerged from its mother, they do know what forces may have been driving the transition from egg laying and what evolutionary steps may have preceded it. Amphibians are ectothermic, tetrapod vertebrates of the class amphibia. They are endemic to eastern arc forests and wetlands in tanzania, and all except n. Sep 28, 2018 there are five extant species of mammals that lay eggs. Thus amphibians typically start out as larvae living in water, but some species have developed behavioural adaptations to bypass this. Jan 16, 2016 many animal groups have some species that lay eggs and others that birth live young, including fish, amphibians, and yes, even mammals, says whit gibbons, evolutionary biologist at the university. Certain kinds of sharks even nourish their growing babies in the womb, so they are born bigger and are then better able to look after themselves. Sharks have a variety of reproductive strategies, although they can be divided into two main groups. Reptiles usually lay eggs, and the babies then grow inside the egg until they are ready to come out. Reptiles usually have dry, scaly skin and a kind of leathery eggs, where amphibians lay soft eggs with a jellylike substance around it in the water. Amphibians reproduce by laying eggs that do not have a soft skin, not a hard shell.
May 11, 2019 ill give an answer for each of the five traditional groups of vertebrates. Most amphibians lay their eggs in water and have aquatic larvae that. And a few mammals lay eggs in nests, hatch and nurse their babies, while others lay an egg then place it into a pouch on its mothers body where it is hatched a. Among frogs, those of the genus pristimantis lay eggs on land, which develop. Life as an amphibian the typical life cycle of amphibians is a larval stage that lasts a few months, followed by a brief metamorphic period, then a long, multiyear life on land. One of these things is that with a few exceptions amphibians lay eggs. Most females lay eggs in the water and the babies, called larvae or tadpoles. Do mermaids lay eggs underwater or give birth to live young. Asked in amphibians do amphibians give birth to live young. Like the two rare mammals that lay eggs, this trend is broken for reptiles by a few species that give live birth to their young. Guppies, some sharks and stingrays have live young.
The common garter snake gives birth to live young, while rat, grass, king and other common snake species lay eggs. For dolphins the average gestation period the period from conception to birth can vary significantly depending on the species from 9 months all the way up to 17 months. They inhabit a wide variety of habitats, with most species living within terrestrial, fossorial, arboreal or freshwater aquatic ecosystems. A female cod produces up to 9 million eggs in a year. Although true viviparity has been described in the african frog nectophrynoides, most amphibians lay eggs. Among frogs, those of the genus pristimantis lay eggs on land, which develop directly into miniatures of adults with. In this sense, amphibians are more like fish or birds than they are like mammals. Another difference is the way animals give birth to their young babies. Bony fish produce large numbers of eggs that may scatter throughout the ocean, sometimes getting eaten by predators along the way. In reptiles alone, it has evolved at least 121 separate times. This group includes animals such as frogs, toads and salamanders. Some species lay their eggs in water, some in soil. The adults return to the water to court and ultimately lay eggs. Some of these are ovoviviparous, with the eggs being hatched inside the mothers body, and others are viviparous, with the embryo developing inside her body, as in mammals.
Apr 12, 2010 mammals give birth to live young with the exception of the platypus and the echidna, which lay eggs. They produce young within their bodies rather than in eggs, and they give birth to live young. A few species give birth to live young, nourishing them with glandular. One of the defining characteristics of mammals is that they give birth to young ones and raise them on milk from the mammary glands. But not all fish give live birth, it really depends on the species. Apr, 2020 one of these things is that with a few exceptions amphibians lay eggs. Off the top of my head i can think of platy, mollies, swordtails, and guppies. Most species lay their eggs underground and when the larvae hatch, they make their way to adjacent bodies of water. Mammals give birth to live young with the exception of the platypus and the echidna, which lay eggs. You will find lizard eggs of geckos, iguanas and monitor lizards. Scientist spies frog giving birth to live tadpoles live science.
They do not feed at all through the developmental period, and can have over 20. The ethiopian altiphrynoides includes spinophrynoides, which lay eggs. There are some species of frog which give birth to live young, rather than laying eggs, such as members of the african. Instead, birds form and lay eggs that are incubated outside the body. Some salamanders, however, retain the eggs within their body and give birth to live young. This means that the eggs of frogs dont have a hard protective layer over their eggs as birds and reptile eggs do. Asked in amphibians, frogs do frogs lay eggs or give birth to living babies. Many animal groups have some species that lay eggs and others that birth live young, including fish, amphibians, and yes, even mammals, says whit gibbons, evolutionary biologist at the university. Even among lepidosaurs, most lay eggs that hatch into young, but there are a few lizards and snakes that give birth to live young. Birds give birth to eggs as well as most reptiles beside a gartner snake and few more.
Scientist spies frog giving birth to live tadpoles live. All are amphibians, which means they spend part of their lives in water and part of their lives on land. These features truly make the platypus one of the most unique creatures on earth. Birds lay and hatch eggs in places that are inconspicuous and away from predators. Fish and amphibians lay soft gelstyle eggs, by the thousand. Jun 15, 2018 the scorpions eggs hatch while still inside her body, so by all appearances, she gives live birth. But regardless of whether a reptile lays eggs or gives live birth, only crocodiles and related reptiles practice parental care of young in other words, when most reptiles lay eggs, the eggs are laid in a location and left to either hatch or be eaten. You notice that more advanced species have fewer offspring. Mar 03, 2020 this means that the eggs of frogs dont have a hard protective layer over their eggs as birds and reptile eggs do. Members of the african genus nectophrynoides retain eggs in the oviduct and some nourish the young as they grow. Frogs and other amphibians lay eggs, but mammals give birth to live young, right.
Most lizards lay eggs but anguid, many skinks, some chameleons, night lizards, common lizards and some gecko species all give live birth to young. Amphibians lay thousands and sometimes millions of small, soft eggs, and they. Mammals have live births, with fewer than 10 offspring. Sometimes reptiles will give birth like mammals, without eggs. Best answers this threestage life cycle has many environments, and some amphibians, including a few frogs and toads, the fire salamander and several species of caecilians, are viviparous. Why some toads dont have tadpoles natural history museum. Reptiles, on the other hand, generally lay eggs to hatch their young. Mammals give birth to live animals besides the platypus. There are some species of frog which give birth to live young, rather than laying eggs, such as members of the african genus nectophrynoides.
Frogs can be large or small, poisonous or not, but they all have some things in common. They are small frogs whose eggs are laid on land and develop directly into small. Most amphibians lay eggs, but this is not the case with all of them. In fact whales are marine mammals, which means they share many of the same distinctive features as other mammalian species some of these features include breathing air, going through pregnancy commonly referred to as a gestation period and giving birth, being born with hair some species of whale actually have hair when they are born, being a warmblooded. Amphibians typically breed in freshwater, laying eggs that hatch into aquatic larvae and then undergo metamorphosis into adult forms that live mainly on land. These amphibians need a safe, undisturbed body of water to lay their eggs in. Amphibians are coldblooded animals that must stay close to water. They either lay eggs which then hatch into miniature toads, or retain the eggs inside their bodies and give birth directly. Unlike other tetrapod vertebrates reptiles, birds, and mammals, amphibians do not produce amniotic eggs. A newly described species of frog gives birth to live. There are five extant species of mammals that lay eggs. The soontobe mother bear has a gestation period of just over 7 months.
In contrast, sharks which are cartilaginous fish produce relatively few young. Why do lizards lay eggs and reproduce like mammals has a simple reasoning. Do amphibians give birth to live young or lay eggs answers. Eggs range in size depending on the bird and can be as small as 0.
This threestage life cycle has many environments, and some amphibians, including a few frogs and toads, the fire salamander and several species of caecilians, are viviparous. Amphibians must lay their eggs in a moist environment. The platypus has a bill like a duck, a tail like a beaver, the skin and feet of an otter, and venom like a snake. Dec 31, 2014 frogs and other amphibians lay eggs, but mammals give birth to live young, right. What do amphibians, reptiles, birds and fish have in.
Many different species have live births, from insects to fish to reptiles to mammals. Bears do not lay eggs, they give birth to live young like all other mammals do. The embryos are nourished with uterine milk secretions they scrape off the walls of their mothers oviducts. Additionally these animals can lay thousands of eggs each year rather than giving birth to a single offspring every 1 to 6 years the way dolphins and other cetaceans do. Others brood their eggs and the larvae undergo metamorphosis before the eggs hatch. Courtship displays in frogs are almost entirely vocal, although in salamanders they may involve tactile, visual, and. Birds, fish, insects and reptiles lay eggs although there are again a few exceptions ie some sharks give birth to live young.
This question is a bit too broad to answer about how all vertebrates give birth. Amphibians are ectothermic coldblooded vertebrates that do not maintain their. This method of reproduction is called ovoviviparity. A newly described species of frog gives birth to live tadpoles, and is the only known frog to do so.
Some reptiles, amphibians, fish and invertebrates carry their developing young inside them. Frogs and other amphibians lay eggs, but mammals give birth to live. African toads that give birth to live young evolved the strategy to cope. Many animal groups have some species that lay eggs and others that birth live young, including fish, amphibians, and yes, even mammals, says whit gibbons, evolutionary biologist at. There is also the difference that some amphibians like the frog lay up to 20.
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