Quick Answer: What Animals Dont Have Eyes?

Which animal has the best memory?

DolphinsMarine mammals can remember their friends after 20 years apart, study says.

Sorry, elephants: Dolphins have taken the top spot for best memory, at least for now..

Which animal does not have eyes?

HydrasHydras belong to one of the oldest groups of animals on the planet, the Cnidarians. Although hydras do not have eyes, other members of their family have simple eyes called ocelli. Box jellyfish have remarkably sophisticated eyes with lenses and retinas.

What animal has only one leg?

Many bivalvia and nearly all gastropoda molluscs have evolved only one foot. Through accidents (i.e. amputation) or birth abnormalities it is also possible for an animal or a human being to end up with only a single leg.

Why do eyes have two?

Having two eyes means that the light from the same source hits each eye at a different angle, giving our brains a way to determine distance of the object. Alternatively, one eye can be placed on each side of the head (as in many birds and fish) so that you can see the entire surroundings at the same time.

Which animal is born deaf?

Dogs are an altricial species, which means that the puppies aren’t fully developed at birth. Puppies are born deaf and with their eyes closed, a characteristic they share with many other mammals. This is because their senses still aren’t fully developed.

What has an eye but no head?

Answer Expert Verified needle, cyclone, potato etc… have eye but no head….

Can your eye Colour change with mood?

The pupil can change size with certain emotions, thus changing the iris color dispersion and the eye color. You’ve probably heard people say your eyes change color when you’re angry, and that probably is true. Your eyes can also change color with age. They usually darken somewhat.

Who has the best vision ever?

It seems that the best eyesight ever reported in a human was in an Aborigine man with 20/5 vision! To give you an idea of how clear and far he could see, his vision measurement compares to the natural sight of eagles. From 20 feet, he could perceive the fine details that most people can only see from 5 feet away!

Do giraffes have 2 Hearts?

Three hearts, to be exact. There is a systemic (main) heart. Two lesser hearts pump blood to the gills where waste is discarded and oxygen is received. They work like the right side of the human heart.

Which animal blood is black?

The ocellated icefish, for instance, may brush fins with the Antarctic octopus in the same chilly habitat, but its blood is quite different. It runs completely clear. The polar dweller lacks both hemoglobin and hemocyanin, leaving its blood without any color at all.

Which animal has no brain and heart?

JellyfishJellyfish don’t have brains They don’t have a heart, lungs or a brain either! So how does a jellyfish live without these vital organs? Their skin is so thin that they can absorb oxygen right through it, so they don’t need lungs.

Which animal has the roughest tongue?

Giant AnteaterGiant Anteater And if you think you know some fast talkers consider this: The anteater can flick its tongue 160 times a minute.

Are butterflies deaf?

A butterfly species equipped with tiny ears on its wings can distinguish between high and low pitch sounds, possibly as a way to listen in on nearby birds, new research suggests. Scientists thought butterflies were deaf until 1912 when the first butterfly ears were identified.

Who has the worst eyesight in the world?

Japanese people tend to have the worst eyesight of any national group in the world — it is estimated that over 60% of Japanese wear either contacts or eyeglasses on a daily basis. Other vision problems are common in Japan too. In 2005, researchers found that 1 in 20 Japanese men were colorblind.

Which animal has no tongue?

Taste sensations Other animals naturally have no tongues, such as sea stars, sea urchins and other echinoderms, as well as crustaceans, says Chris Mah via email. Mah is a marine invertebrate zoologist at the Smithsonian National Museum of Natural History and has discovered numerous species of sea stars.

What race has the worst eyesight?

The prevalence of hyperopia differed significantly among racial/ethnic groups (P = 0.007), with the highest rate in non-Hispanic white children (11.9%) and the lowest rate in Asian children (5.47%).

What animal has 3 hearts?

octopusAn octopus has three hearts, nine brains, and blue blood. Two hearts pump blood to the gills, while a third circulates it to the rest of the body. The nervous system includes a central brain and a large ganglion at the base of each arm which controls movement.

What animal has no brain?

SpongesThere is one organism that has no brain or nervous tissue of any kind: the sponge. Sponges are simple animals, surviving on the sea floor by taking nutrients into their porous bodies.

What animal has 800 stomachs?

Etruscan shrewPhylum:ChordataClass:MammaliaOrder:EulipotyphlaFamily:Soricidae11 more rows

Are any animals deaf?

Deafness—the absence of perception of sound—and reduced hearing are common in dogs and cats, and to a lesser extent in other species. Deafness can be hereditary or acquired, congenital or later onset, and sensorineural or conductive.

Do any animals have 3 eyes?

Currently voted the best answer. The Tuatara, a lizardlike reptile that lives only in New Zealand, has those three “eyes”. It belongs to a group of reptiles that once included many other creatures, but today, the Tuatara is the only surviving member of that group.

What animal has green blood?

Credit: Photo by Chris Austin, LSU. Green blood is one of the most unusual characteristics in the animal kingdom, but it’s the hallmark of a group of lizards in New Guinea. Prasinohaema are green-blooded skinks, or a type of lizard.

Are any animals blind?

Just like humans, animals can become blind as well. Blindness in animals can be caused by many of the same things that cause blindness in humans. … Many species of mammals, such as rabbits, are actually born blind (born with their eyes closed and eyelids fused together), with their eyes opening a little while later.

Do all animals have 2 eyes?

While all mammals are believed to have two eyes, some species can have eyes that are vestigial. This means that their eyes are so small that they do not function or work. … Now you can see that in the animal world, there can be creatures with no eyes, lots of eyes, two eyes, and even one.

Do cows have 2 Hearts?

Cows have only one heart. Just like humans and other mammals and birds, the heart is internally divided into four chambers.

What animals Cannot see?

Totally blind speciesSome moles (the star-nosed mole can detect, catch and eat food faster than the human eye can follow; under 300 milliseconds)Sinopoda scurion (blind huntsman spider)Thaumastochelidae (blind deep-sea lobsters)Blind cave fish.Cave crickets.Texas salamanders.Blind flatworms.More items…

Which animal has 32 brains?

LeechLeech has 32 brains. A leech’s internal structure is segregated into 32 separate segments, and each of these segments has its own brain.

Do sharks have tongues?

Sharks have a tongue referred to as a basihyal. The basihyal is a small, thick piece of cartilage located on the floor of the mouth of sharks and other fishes. It appears to be useless for most sharks with the exception of the cookiecutter shark.