Top 10 Animals That Are Asymmetrical

The majority of animals have outward radial symmetry and interior asymmetry. This, however, is not always the case. The following are the Top 10 Asymmetrical Animals.

The majority of creatures have radial symmetry on the outside and asymmetry on the inside. Morphological symmetry in animals refers to the correspondence of various external bodily components on opposing sides in terms of shape, size, and location. The internal organs of most animals are asymmetrical. Some species, on the other hand, show radial asymmetry both inside and externally. Asymmetry is a rare characteristic that evolved independently in plants and animals over time. The following animals exhibit external asymmetry:

Animals That Are Asymmetrical
Animals That Are Asymmetrical ( Image Credit: Flickr )


Plaice is a grouping of four flatfish species: scale-eye plaice, Alaskan plaice, American plaice, and European plaice. The most common commercial flatfish in Europe, European plaice, may be produced in an aquarium. Plaices are symmetrical while they are young, but as they grow and spend more time on the sea bottom, one eye grows on the side that looks upwards. Plaices, both European and American, are right-eyed Pleuronectidae flounders. European plaice eats at night in shallow water and hides on the beach during the day. America plaice is a kind of Atlantic fish that may be found from Rhode Island to Labrador. American plaice are smaller and have a reddish hue than European plaice.


Wrybills, also known as ngutuparore in New Zealand, are a kind of plover. Wrybill bills are long and curved to the right. Wrybills are little fat plovers that weigh around 2.5oz and are about 8.3inches long. Males have white crests and pale gray tails, wings, back, neck, and crowns. Males are distinguished by a white rump, belly, breast, and throat, as well as a thin black stripe across their chest. The black band on female wrybills is narrower. The black band that runs between the male wrybill’s gray crown and white forehead is another sex characteristic.

Fiddler Crab

Any of the 100 semi-terrestrial marine crab species in the Ocypodidae family is referred to as a fiddler crab. These crabs may be found in marshes, lagoons, and along the coast. Fiddler crabs are known for their sexually dimorphic claws. Male fiddler crabs have bigger primary claws than female crabs, although both have the same size claws. These crabs, like other crabs, shed their shells as they grow. When they molt, if they lose a claw or a leg during their current development cycle, they create a new one. Male crabs molt by developing a new claw on the opposite side of their body.


Narwhales are medium-sized whales that have a large tusk that protrudes from a canine-tooth on their upper left jaw. Narwhale is a living Monodontidae family member. Narwhales may be found off the shores of Russia, Canada, and Greenland in the Arctic waters. Their body length varies from 13ft to 18ft, with females being somewhat shorter than males. A mature narwhal weighs around 3,540 pounds. Dorsal fins are absent in these whales. Their neck vertebrae are not fused, as in most whales, but rather jointed, like in many mammals.

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Sperm Whales

Sperm whales are the Physeter genus’s greatest toothed predators and toothed-whales. Sperm whales are pelagic creatures that dwell all over the world and can migrate for breeding and feeding on a regular basis. Mature male sperm whales may reach lengths of up to 67 feet. Sperm whales are the second deepest diving animals in the world, after only Cuvier’s beaker whales. Sperm whales use a single nostril on the top left side of their forehead as a blowhole. They communicate by blowing via their right nostrils, which have evolved into phonic lips.

Honey Badger

Honey badgers are the only members of the genus Mellivora and the Mellivorinae subfamily. Ratels, sometimes known as honey badgers, are widespread in India, Southwest Asia, and Africa. Honey badgers may reach lengths of up to 30 inches (excluding the tail) and heights of 11 inches. Males are somewhat larger than females. All honey badgers are symmetrical, with the exception of the subspecies signata. The signata ratels subspecies has a second molar on the left side of their lower jaw but not on the right.


All shelled gastropods are referred to as snails. Gastropods with no natural shell are called slugs, whereas those with little shells are called semi-slugs. All gastropods, including snails, are asymmetrical. Snail shells spiral either anticlockwise or clockwise. Slugs are asymmetrical as well.

Pareas Iwasaki

Pareas Iwasaki is a species of snail-eating snake in the Pareidae family. Pareas Iwasaki might be found on the Yaeyama Islands of Japan. Snails are eaten by all Pareas snakes, even newly born Pareas Iwasakis. Because of their asymmetrical jaws, these snakes may eat on clockwise-coiled snail shells. Because of their asymmetrical jaws, these snakes can only eat on snails with anti-clockwise coiled shells.


Histioteuthis, often known as cock-eyed squid, is a squid genus and the only member of the Histioteuthidae family. Histioteuthis is known as a cocked-eyed squid because its right eye is sunken, blue, round, and typical in size, but its left eye is twice as big. It has an upward-facing tubular left eye. Researchers from Duke University revealed that this squid uses its smaller eye to detect bioluminescence from its prey and its bigger eye to interpret ambient light.

Perissodus microlepis

Perissodus microlepis is a cichlid fish that can only be found in Lake Tanganyika. It is a scale-eating fish that may reach 4.3inches in length. Perissodus microlepis is very often found in the aquarium trade. These cichlid species have two distinct morphological characteristics. One morph’s mouth is curved to the right, allowing it to feed on the left flank scales of its prey. The mouth of the other morph is curved to the left, allowing it to swallow the scales on the right side of its victim. The quantity of these two categories is determined by frequency-dependent selection.

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