cetaceans:
- whales,
- the Dolphins,
- porpoises,
- the sperm whale,
- killer whales,
- the beluga,
- the narwhal;
How are baby sharks born? the requin-whale is oviparous, like birds. It lays eggs which are then expelled into the sea. Each of these eggs attaches to stones with filaments. Inside, an embryo develops for 6 to 10 months ...
Is the jellyfish a mammal?
La Medusa is an invertebrate marine animal shaped like a bell or, if you like, an umbrella. There are several species of jellyfish. She inhabits all seas and oceans. She has no brain, lungs, blood or skeleton.
Is a dolphin a mammal?
Like all mammals, dolphin is a homeotherm, commonly called warm-blooded animal. He maintains his body at the same temperature regardless of the ambient temperature. Whether it's 28 ° C or 15 ° C in water, it keeps it stable.
Which marine animal is a mammal?
baleen or mysticete whales, which include fin whales, right whales, gray whales and pygmy whales; toothed whales or odontocetes, which include sperm whales, dolphins (including killer whales and pilot whales), porpoises, beaked whales, beluga and narwhal.
Do sharks lay eggs?
After mating, the female can lay dozens ofeggs that they twist in pairs on the algae or the rocks. True protective armor, the capsule that encloses the embryo is made up of Keratin, protein and main constituent of nails in humans.
Do dolphins lay eggs?
The dolphin is a viviparousisthat is to say that he carries his young in his uterus and feeds it by an umbilical cord then by its udders at birth. ... It can be oviparous (lays eggs), ovoviviparous (œuf hatched in the belly of the female) or viviparous.
What is the most dangerous shark in the world?
Among those responsible for bites on men, we find the more commonly: the big requin White ; the requin-tiger; the requin-bulldog.
Is the jellyfish a fish?
Neither a vertebrate with a skeleton, nor a shelled crustacean, nor a shelled mollusk, the jellyfish is simply formed of a dermis lined with striated circular muscles at the level of the parasol and radial muscles at the level of the tentacles.
How old are the jellyfish?
The lifespan of jellyfish generally ranges from a few days to two months for small species, one to two years for larger ones.
Do jellyfish lay eggs?
Fertilization of jellyfish : œuf, polyp and planula
There are male colonies and female colonies. ... They emit eggs and sperm in the sea and, after fertilization, theœuf transforms into a planula which in turn attaches itself and forms a polyp.
Why is the dolphin not a fish?
Contrary to fish, dolphin must rise regularly to the surface of the water. It is a vital need for him since his breathing depends on it. Like all mammals, it breathes through the lungs. It renews its oxygen to the surface through its vent, a small hole located at the top of their head.
Is the narwhal a mammal?
Le narwhal (Monodon monoceros, which means horn or single tooth) is a cetacean belonging to the Monodontidae family. This mammal Marine is nicknamed unicorn of the seas because it wears a very long "tusk". It lives in the Arctic Ocean, off Greenland, Norway, Canada and even Russia.
Is the whale a mammal?
Just like fish, Whales spend their lives underwater. However, the Whales are mammals and not fish.
Which animals are mammals?
The top 20 orders of mammals
- The toothless: anteaters, armadillos, sloths ...
- Marsupials: kangaroos, wallabies, wombats ...
- Oviparas: platypuses, echidnas ...
- Insectivores: shrews, hedgehogs ...
- Primates: lemurs, marmosets, humans ...
- Pangolins: pangolins.
- Orycteropus: orycteropus.
Which animal is part of the mammals?
The with animals from the class of mammals have been divided into three subclasses: mammals Placental or Eutherian (Primates, Carnivores, Rodents, Edentulous, Insectivores, Proboscidians, Cetaceans, etc.), Marsupials or Metatherians (Kangaroos, Wallabies, Koalas, etc.)
Are birds mammals?
The birds belong to the class of Vertebrates, the group of animals with a backbone. More precisely, the Bird belong to the group of tetrapods, vertebrates with four limbs, which also include amphibians, mammals and all reptiles.
What is the only mammal that lays eggs?
With the Platypus, it is part of the order of Monotremes, only mammals that lay eggs.
What is the particularity of Ovoviviparous?
The ovoviviparous
La peculiarity of ovoviviparous to combine these 2 modes of reproduction. a ovoviviparous comes out of his mother's body alive. In this they are viviparous. However, their development takes place in an egg, like the oviparous, but who is preserved in the belly of the female.
What is the difference between oviparous and viviparous?
Oviparous : In different animal species, the female lays eggs. Viviparous : Refers to the species whose young (s) develop (s) inside the belly of the female. This are often mammals. Exception for the platypus: it is oviparous (lays eggs) but is breastfeeding.
Why are dolphins not fish?
Contrary to fish, the dolphin must rise regularly to the surface of the water. VS'is a vital need for him since his breathing depends on it. Like all mammals, it breathes through the lungs. It renews its oxygen to the surface through its vent, a small hole located at the top of their head.
Are dolphins dangerous?
In the collective imagination, the dolphin is an affectionate, clever and courageous animal, very friendly with the human being. In fact, itis everything else. ... Fortunately, all dolphins are not also dangerous and most have peaceful relations with their neighbors.
How does a dolphin behave?
On average, the dolphin weighs 75 kg and measures between 1,5 and 2,5 meters. It has a fairly long nose known as a beak or rostrum, a fin and two fins, as well as a flat, forked tail (the caudal). The latter allows it to balance and se guide.