• Saturday March 28,2020

Sea Animals

We explain what are the animals of the sea, what types exist and their characteristics. In addition, examples and which are the most dangerous.

In addition to fish, there is an enormous biodiversity in the sea.
  1. What are the animals of the sea?

Sea animals or marine animals are those that are adapted to life inside the sea, on its surface or on its banks . Since our planet is two-thirds of its surface covered by water, marine life encompasses a huge and diverse number of animals, spread across the five oceans and adapted to their specific habitats.

Among the marine animals are the descendants of the oldest known organisms. In fact, as far as we know, life had its beginnings in the primitive oceans of the Precubric geological era, billions of years ago.

However, not all life forms have the same origin, since many species of reptiles and marine mammals come from land species, which were adapted back to the ocean.

The sea is also home to millions of species of microorganisms and plant species, which play a very important role in the oxygenation of the planet. In addition, they support the rest of the marine traffic chain.

In other words, the oceans are an important source of biodiversity in the world and of constant food for various non-marine species, including the human being himself.

It can serve you: Aquatic Ecosystem

  1. Types of sea animals

Abyssal fish only have the light they can produce themselves.

In broad strokes, we can classify marine animals according to the different regions of the aquatic mass of the oceans in which they live. We have like this:

  • Surface animals, those closest to the Sun and therefore accustomed to the warmest and brightest waters, where algae and plankton abound, but also predators.
  • Reef animals, which form extensive communities around coral, stones and algae forests of various types, in some of the most biodiverse places on the planet, equivalent to rainforests, but under the sea.
  • Deep animals that live in colder and dark waters, at greater depth, in a more exclusive and challenging habitat.
  • Abyssal animals, inhabitants of the deepest, darkest, icy and inhospitable regions of the sea, to which sunlight does not reach and which are under immense environmental pressures.
  1. Characteristics of sea animals

Marine mammals have lungs and must return to the surface to breathe.

Sea animals are very diverse in nature, as they are distributed throughout various underwater environments and integrated into highly specific trophic chains.

Thus, it is possible to find representatives of practically all types: microorganisms or microscopic animals; invertebrates such as sponges, worms, jellyfish and mollusks; arthropods; echinoderms; a large variety of bony and cartilaginous fish; aquatic life mammals; reptiles and amphibians, and on the surface, crossing land, air and water, different species of birds.

However, among such diversity of life forms, we can distinguish large groups according to their breathing. Some breathe through underwater mechanisms, such as gills. On the other hand, others still have lungs to breathe the air, being forced to ascend to the surface every so often to breathe.

Similarly, marine animals differ from terrestrial animals in that their limbs are adapted to displacement within the aquatic fluid, so the presence of legs is replaced by fins, even in those animals that come evolutionarily of a terrestrial habitat.

See also: Reproduction of fish

  1. The most dangerous marine animals

There is a wide variety of jellyfish that can cause different intensities of damage.

In general, marine life does not represent a threat to the human being, although unfortunate encounters exist and occur from time to time. The human being is not part of any ocean traffic chain, so no animal contemplates it as a potential food, except by mistake.

That does not mean that there are no animals with the potential to harm us, such as:

  • The shark Contrary to what the movies make us believe, cases of shark attacks are extremely scarce and accidental, although possible. Of the bulk of the shark species, only a few are able to harm a swimmer or a diver, and among them are the tiger or dyer shark, the white shark and eventually some blue sharks
  • Toad fish These species of reef fish have different names, such as scorpion fish, toad fish, salamander fish, but they have in common their camouflage that makes them look like a stone. Together with other species endowed with bright and colorful coloration, these animals have poisonous glands capable of inducing catastrophic failures in the organism, provided that we step on them by mistake or eat them without care.
  • Jellyfish There is a huge diversity of jellyfish of different sizes, from microscopic to several meters in length, such as the famous Portuguese Warship ( Physalia physalis ). The latter is capable of killing a human being if he were entangled in his long and poisonous tentacles, which would induce him to a paralysis and death by drowning. This would, of course, without the jellyfish proposing it at all.
  1. List of sea animals

The blue whale can weigh up to 180 tons and is the largest animal in the world.

A necessarily partial list of marine animals would include the following:

  • White shark ( Carcharodon carcharias )
  • Tiger shark ( Galeocerdo cuvier )
  • Hammerhead shark ( Sphyrna mokarran )
  • Sardine ( Sardine pichardus )
  • White tuna ( Thunnus alalunga )
  • Marine anemone ( Actinaria sp. )
  • Pillar Coral ( Dendrogyra cylindricus )
  • Hermit Crab ( Birgus latro )
  • Marine lobster ( Palinurus elephas )
  • Stonefish ( Synanceia horrida )
  • Whale shark ( Rhincodon typus )
  • Blue Whale ( Balaenoptera musculus )
  • Orca whale ( Orcinus orca )
  • Common seal ( Phoca vitulina )
  • Sea lion ( Otaria flavescens )
  • Common octopus ( Octopus vulgaris )
  • Marine angelfish ( Chaetodontoplus septentrionalis )
  • Mantarraya ( Manta birostris )
  • Brunette ( Gymnothorax javanicus )
  • Green mussel ( Perna viridis )
  • Portuguese warship ( Physalia physalis )
  • Barracuda ( Sphyraena barracuda )
  • Marine crocodile ( Crocodylus porosus )
  • Common Dolphin ( Delphinus delphis )
  • Spider crab ( Macrocheira kaempferi )
  • Marine iguana ( Amblyrhynchus cristatus )
  • Imperial Cormorant ( Leucocarbo atriceps )
  • Common Pelican ( Pelecanus occidentalis )
  • Seagull ( Larus argentatus )
  • Grouper fish ( Epinephelus itajara )
  • Hawksbill turtle ( Eretmochelys imbricata )
  • Abyssal Pelican Fish ( Eurypharynx pelecanoides )

Continue with:

  • Animals of the forest
  • Desert animals
  • Jungle animals

Interesting Articles

Unicellular Organisms

Unicellular Organisms

We explain what unicellular organisms are, their characteristics and the first unicellular organism. Classification, importance and examples. The appearance of unicellular organisms is still difficult to explain. What are unicellular organisms? Unicellular organism is called to all those forms of life whose body is composed of a single cell , and that do not form any type of tissue, structure or body together with others of its kind



We explain what the phenotype is and what are its differences with the genotype. In addition, some examples of phenotype. The phenotype is determined by the unique genetic configuration contained in the DNA. What is the phenotype? In genetics, there is talk of a phenotype to refer to the observable physical characteristics of an organism , product of the expression or manifestation of the genetic information contained in the genotype, in accordance with the conditions of the determined environment in which the organism lives

Color Theory

Color Theory

We explain what Color Theory is, historical examples and color properties. In addition, the RGB and CMYK color models. The rules of Color Theory allow to achieve the desired effects. What is the theory of color? Theory of color is known as a set of basic rules that govern the mixing of colors to achieve desired effects, by combining colors or pigments



We explain to you what the law is and what is the purpose of the legal norms. In addition, types of laws and what are their characteristics. Laws are a way to control the behavior of human beings. What is law? The concept of law comes from the Latin lex and within the juridical scope it can be defined as those general norms of obligatory character that have been dictated by the corresponding power with the objective of regulating the behaviors human

Application Software

Application Software

We explain what the application software is, what it is for and examples. In addition, what are the system and programming software. The application software is not part of the operation of the computer. What is the application software? In computer science, it is understood as an application software, application programs, or in some cases applications, as well as the set of software generally installed in the software



We explain to you what lithium is and where this chemical element comes from. Discovery, uses and presence in the human body. Lithium, in its pure form is a soft metal, silvery white and extremely light. What is lithium? The lithium (Li) is a chemical element alkaline, metallic, diamagnetic, but extremely reactive , with rapid oxidation in air or in water In its pure form it is a soft metal, silvery white and extremely light, which is not in a free state in nature