Inhabiting the oceans for more than one hundred million years, the shark has evolved extraordinarily, above all, improving its anatomy and becoming the most feared marine predator species. Thus, being a wild animal, we will go a little deeper into this ferocious animal.
Special features of the shark
The shark establishes its habitat according to its needs, that is, where it gets how to feed — being part of the wild animals of the ocean.
Besides, having few predators usually travels alone in the deep waters of the ocean, but feeling the least provocation, is usually very aggressive in its attack. However, their dangerousness varies according to the type of shark.
Belonging to the family of fish that have cartilage skeletons, the shark may have skin blue, white, brown, gray or mixed tones, also has developed pectoral fins and the typical dorsal fin triangular shape, located in the neck, by which it is always recognized when swimming on the surface.
Likewise, these aquatic species breathe through a series of membranes located on the sides of their bodies, which only filter water to obtain oxygen, only if it is in continuous movement.
Also, the reproduction system of these wild animals varies according to the species, as we can see below:
- VIVIPAROUS: Like the blue shark, the bull or the hammer.
- OVOVIVIVIPARUS: Like the tiger shark or the mako shark.
- OVIPARUS: For example, whale sharks or crocodile sharks.
Feeding the shark
The shark distinguishes itself by enjoying a compassionate auditory sense, which allows it to detect changes in water pressure and the movement of other animals at great distances, in the same way, its extraordinary sight, allows it to see and locate its prey, even with very little light.
Also, his keen sense of smell makes it easier for him to smell the blood in the water several kilometers away.
Another attribute that makes this marine mammal a great predator is its double row of triangular-shaped teeth with pointed edges, which serve to tear the meat or hold the prey before swallowing it. Also, it is capable of replacing those teeth that it loses in its massive combats, reaching up to three thousand teeth during its 20 or 30 years of life.
Generally, most sharks activate their hunting in the afternoon or at night, practicing the strategy of the ambush to catch their prey, being the frequent feeding, fish, crustaceans, mollusks, plankton, krill, marine mammals and other species of sharks.
There are about 400 varieties of sharks, ranging from the largest to quite small, and even some hazardous and others more peaceful, is the following classification:
SHARKS WITH ANAL FIN
- Hexanchiforms, has six or 7-gill slits, such as the cow shark or eel.
- Heterodontiforms, it has a spine like a dorsal fin, just like the horn shark species.
- Orectolobiforms, has the mouth in front of the eyes, as the shark carpet.
- Lamniforms, preserves the internal valve in the ring, are characterized by sharks jurel, megachasma, or the well-known white sharks.
- Carcharhiniforms, has the internal valve in a spiral, like the blue shark, tiger or hammerhead.
SHARKS WITHOUT ANAL FIN
- Squaliforms, exhibits a little mouth, such as the blackberry shark or dog.
- Pristhophoriformes, has an elongated saw-shaped snout, like saw sharks.
- Squatiniforms, has the flattened body and mouth in front, like the angel shark.
Finally, the shark is the top of the marine food chain, as it regulates the population of species below it.
How do sharks reproduce?
To know how sharks are born, we must first know that, in addition to viviparity, they have other forms of reproduction, since there are also oviparous and ovoviviparous sharks. Sharks reproduce in the following ways:
- Oviparous sharks: Oviparous sharks are those that reproduce by laying eggs in the environment.
- Oviparous sharks: Also called placental viviparous sharks. In this case, the females do not lay the eggs but keep them inside the body, where hatching takes place. The hatchlings feed on the contents of the egg and not on their mother, as in the case of mammals. Small sharks hatch from the egg and continue to feed on unfertilized eggs produced by the female. When the female ceases to do so, it is time for the young to be born.
- Viviparous sharks: However, within ovoviviparous sharks, some species are placental and are called viviparous. In these cases, when there are no more nutrients inside the egg, a system similar to the placenta of mammals is produced, which serves to keep the young nourished.
What do shark eggs look like?
Eggs are essential structures in reproduction, regardless of how the sharks were born, since, in any case, the development of the young will depend, to a greater or lesser extent, on the generation of an egg.
Shark eggs are very different from the eggs we are used to seeing. In oviparous sharks, those that laid eggs in the middle; what we will see is a hard capsule with formations similar to tendrils that facilitate their anchorage in rocks or algae. In some species, this capsule acquires a shape similar to that of a screw, with the same purpose of subjection.
Therefore, we can find eggs with more or less striking designs according to the needs of each species. Some of these elongated and translucent capsule eggs are popularly known as mermaid bags. We can find them, empty, on the coasts.