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What Animal Has The Smallest Brain

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Bizarre Brains Of The Animal Kingdom

What Animal Has the Largest Brain?

Wednesday, May 8, 2019

By: Charlotte Swanson

The ripples and folds of the brain are the source of all of our actions, emotions and instincts. While you may know what a human brain looks like, animal brains come in a variety of shapes and sizes. Still, no matter what they look like, all brains are made up of a grouping of nerve cells and act as the coordinating centre for sensation and actions.

Animals That Dont Have A Brain: Sea Cucumbers

Natalia Siiatovskaia/Shutterstock.com

The wormlike sea cucumber feeds on plankton, and the leathery-skinned animals are everywhere. Sea cucumbers are extremely dangerous but, without a brain, theyre not necessarily a deliberate threat. They are capable of releasing a toxic substance called holothurin, which can blind humans permanently.

There are more than a thousand types of sea cucumbers. Many of the species live in deep water. They can swim up to 3,300 feet, floating back to the bottom of the ocean floor.

Sea cucumbers feed instinctively, using tubular feet around the mouth to catch and take in food. Their diet consists of aquatic invertebrates, algae, and waste. Curiously, while they lack the facility to even realize it, these sea creatures exhibit asexual and sexual reproduction.

Animals That Dont Have A Brain: Man

The man-o-war doesnt have a head to even store a brain.


Another wobbly-like critter with a venomous sting, the Portuguese man-o-war is up there on the list of strangest animals on the planet.

While we refer to the creature in the singular, we should actually say man-o-wars. You see, the animal is actually a colony of polyps, also referred to as zooids. Connected by tissue, the colony cannot survive individually.

The creature has a deadly sting, but thats useless against its greatest foe, the Sea Turtle. The man-of-wars stinger cannot penetrate the turtles thick skin. Even a sting to the tongue doesnt deter the sea turtle. The fish also goes to the mat with birds. The man-o-war dives deep when birds approach and shoots gas from its bladders.

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Do Elephants Have The Largest Brain

Among terrestrial mammals, elephants share the unique status, along with humans and great apes, of having large brains, being long-lived and having offspring that require long periods of dependency. Elephants have the largest brains of all terrestrial mammals, including the greatest volume of cerebral cortex.

What Is The Smallest Brain

Human, elephant, dolphin, gorilla, macaque, dog, cat ...

A model of Einsteins brain is included in the exhibition and there is footage of the worlds smallest known brain the nematode worm C. elegans, a 1mm-long worm which has just 302 neurons compared to the estimated 86 billion neurons of a human brain. It is the only brain to be fully mapped by scientists.

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Dumbest Animals In The World: Sloth

The sloth, who is one of the dumbest and slowest animals, can take 30 days to digest a leaf.

Sloths reside in South and Central Americas lowland tropical regions, spending their time in the first canopy. There are two- and three-toed sloths. Sloths hit the big time after the Ice Age movies, thanks to Sid the Slot. He could be simple-minded but often used his brains to save the day. Forget Sid the Sloth. The truth is these animals are dumb. The Sloth could be the stupidest of the dumbest animals.

Well, maybe not stupid animals so much as lazy. They sleep pretty much all day every day. Rumor is they only leave the tree for a quick trip in the shrubs for a bathroom break. After this, it crawls back into the tree to get more beauty sleep. During the trek, its not unusual for the creature to slip and die. Why? It often mistakes one of its own limbs for a tree branch. This leads to all kinds of Jerry Lewis mishaps which end with the end.

Which Animal Has The Smallest Brain

Question #105177. Asked by scottietwenty3. Last updated May 27 2021.

10Currently voted the best answer.Response last updated by CmdrK on May 27 2021.11752 replies7Response last updated by CmdrK on May 27 2021.2344 replies6May 01 2009, 12:50 AM

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What Is The Smallest Pet Fish

1. Indonesian Superdwarf fish Paedocypris ProgeneticaThat being said, Paedocypris Progenetica still holds a world-record title: it is currently the smallest freshwater fish in the world that can live in home aquariums.In fact, it still remains the smallest nano fish species in the world overall discovered to date.More items…

Animals That Dont Have A Brain: Sea Urchins

Probability Comparison Of Animals Brain Size | Biggest & Smallest Brain Size

The sea urchins water vascular system allows it to move quicker.


Sea urchins are pointy, spiky animals, and any beachcomber in their bare feet might discover this in the worst way. Fortunately, outside of South Florida, sea urchins are not poisonous.

The creature has an untold number of legs and controls feeding with its water vascular system. That system changes the amount of pressure and water in its body, allowing it to move faster.

The creatures mouth is beneath it. They expel excrement from the top of their bodies. The sea urchin sits on stones, scraping and feeding on algae. In many ways, this action keeps the ocean clean.

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What Is The Size Of An Elephant Brain

The brain of an elephant makes up less than 0.1% of its body weight. Mountain Gorilla ?They are considered to have a good amount of intelligence with a brain that weighs 430 g. Brainy than a monkey whose brain size is only 22 g. Chimpanzee ?Compared to its body size, a chimpanzee has a brain size of 350 g.

List Of Animals By Number Of Neurons

The following are two lists of animals ordered by the size of their nervous system. The first list shows number of neurons in their entire nervous system, indicating their overall neural complexity. The second list shows the number of neurons in the structure that has been found to be representative of animal intelligence. The human brain contains 86 billion neurons, with 16 billion neurons in the cerebral cortex.

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Box 1 How To Make Brain Soup

Here is the idea: we want to take a brain and destroy everything to make soupexcept the nuclei of the cells that make up the brain. Because each brain cell has only one nuclei, if we find the number of nuclei, we find the number of cells that make up the brain.

Step 1: Put the brain in paraformaldehyde for a few days. This process is called fixation. PFA will make the nuclei membranes stronger, so they wont break later.

Step 2: Separate the part of the brain that you want to know about. Then slice it into small pieces.

Step 3: Put the sliced brain tissue inside the soup-maker glass. This tool is made of two pieces of glass, carefully built so that when one is inside the other the space between the glasses is very very small .

Step 4: Add a detergent to help break up the tissue. Use a special detergent that wont destroy the nuclear membrane .

Step 5: Move the inside glass up and down and rotate it, to break up the brain tissue. This is called fractionating. By rubbing these two pieces of the glass against each other, the friction breaks the brain pieces into smaller and smaller pieces, eventually leaving only the nuclei of the cells . This is sort of like making juice: you press the brain against the glass, just like a fruit is pressed against the rotating juicer reamer to extract its juice.

What Is The Smallest Animal With Eyes And Could It See A Molecule

Patrick the Kangaroo Rat: The Brain

What is the smallest animal with eyes and could it see a molecule?

Hillary Shaw, Newport, Shropshire, UK

It depends what one means by see, eye and molecule.

A single cell could be light-sensitive, but it would only see shades of light and dark. Does seeing imply some degree of comprehension, rather than just instinctual action such as light-avoidance? That would necessitate an eye that could focus and form an image on a retina and a brain capable of understanding that image.

The smallest image that could then be seen would be the size of one light-detecting cell, which is considerably larger than a molecule, unless you count things such as long-chain polymer plastics as a molecule.

We are almost certainly the only animal whose brain knows what a molecule is, anyway.

Lewis OShaughnessy, Nottingham, UK

Camera-type eyes like those possessed by humans, with a lens to focus light captured through an aperture onto photoreceptors, are fascinatingly complex with many different tissues playing unique and essential roles.

No matter how small an eye is, it wouldnt be able to discern a single molecule using visible light

This complexity limits the minimum size of such eyes, which is why smaller animals often have proportionally larger eyes. Still, this kind of eye can be remarkably small minute vertebrates possess these complex eyes, including Brookesia micra, a tiny species of chameleon.

Richard Bradford, Sheffield, South Yorkshire, UK

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Even The Smallest Mammalian Brain Has Yet To Reveal Its Secrets

Max Planck Institute for Brain Research

Max-von-Laue-Strasse 4

DE-60438 Frankfurt am Main

The evolution and function of the cortex remain an enduring mystery in the neurosciences. Some animals, such as bats and star-nosed moles, exhibit remarkable specializations in their sensory organs, which are reflected in specialized cortical architecture. Thus, studying unusual species may reveal aspects of cortical circuit function and evolution.

Fig. 1

Cortical regions in the Etruscan shrew and modules in the rat medial entorhinal cortex. a Sagittal section through the brain of the Etruscan shrew stained for myelinated fibers. b Mapping of some cortical areas on the surface of the Etruscan shrew cortex. Dashed line indicates sagittal section in a. c Surface map of the rat entorhinal cortex area borders are indicated with dashed lines. Green dots show calbindin patches and blue lines the dominant orientation of myelinated fibers. d Immunohistochemical staining of an identified cell allows locating it within a patch of calbindin-positive cells and shows that the cell was immunonegative for parvalbumin but immunopositive for calbindin as shown in the overlay . Aud = Auditory cortex CB = calbindin Ent = entorhinal cortex MEC = medial entorhinal cortex PaS = parasubiculum Pir = piriform cortex PV = parvalbumin Som = somatosensory cortex Vis = visual cortex. Scale bars: 500 µm , 1 mm , 50 µm .

Animals That Dont Have A Brain: Clams

The clams nervous system allows it to function.


Clams are bivalves, which is a mollusk with a compressed body inside of a pair of hinged shells. Others in the family include oysters, mussels, clams, and scallops. Clams can open and close their shells.

The clam manages to function thanks to its nervous system. Theyre popular in the fishing world as clams are easy to catch and live all over the world.

Clams have kidneys, a stomach, mouth, nervous system, and a beating heart.

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Dumbest Animals In The World: Secretary Bird

A secretary bird flying through a dry field. This is one of Africas weirdest birds. It struts about the savannah with the head of an eagle and the legs of a stork.

Secretary birds may look like some of the dumbest birds in the world. These birds that live on the sub-Saharan African grasslands have long legs and sharp toes.

Despite their unusual appearance, the long legs and sharp toes act as an essential defensive mechanism. It allows this bird weighing about 7.3 pounds to stomp with force equal to 36.5 pounds. The force is not only very powerful, but the bird can deliver it in 15 milliseconds. They often use their quick, powerful kick to kill venomous snakes without getting bit if they miss.

Quid Est Animal Stultissimum

Animal Brain Size Comparison | Which Animal Has The Biggest Brain?

Hic sunt quae videntur esse 10 bruta animalia in mundo.

  • #6 Dumbest Animalia in mundo: Goblin Shark. …
  • #5 Dumbest Animalia in mundo: Jerboa. …
  • #4 Dumbest Animalia in mundo: Turkey. …
  • #3 Dumbest Animalia in mundo: Panda Bear. …
  • #2 Dumbest Animalia in mundo: Flamingo. …
  • #1 Animal Dumbest in mundo: Ostrich.

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Animals That Dont Have A Brain: Corals

Irina Markova/Shutterstock.com

The coral and jellyfish are part of the Cnidarians family. Their bodies are asymmetric and they both sting their enemies. Categorized as plants, coral is actually a living animal without a brain.

Heres the great distinction between plants and animals: animals seek food the plant produces its own. The coral joins the animal in seeking food. They make up small lots of tiny creatures. These coral polyps munch on zooplankton lingering in the ocean. Coral catches the plankton with their retractable tentacles and then they feed.

Dumbest Animals In The World: Norwegian Lemmings

Norwegian lemmings spend the winter in underground tunnel systems, located under the snow, where they find shelter from predators.

Norwegian lemmings have long been seen as stupid because they fight animals much bigger than themselves when necessary. These rodents that grow to be about 6-inches long weigh about 4.5 lbs. Yet, they attack animals, like cats, birds of prey, and bullmastiffs.

They use their strong teeth as their primary defensive weapon. Therefore, they have to get close enough to bite their enemy. Their distinctive white cheeks and chin may draw their predators attention towards their mouths.

Learn more about the Norwegian lemming that is a member of the rodent family.

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How Do Brains Work

Research has shown how nerve cells function, passing electrical and chemical information at speeds up to 400 kilometres per hour. The scientific community has a good understanding of how these brain cells, or neurons, function on an individual level, passing signals from one neuron to the next. The big picture, however, is a mystery we havent fully solved yetdeciphering how these neurons coordinate by the millions to receive and send information simultaneously and linking all the bodys systems and organs to function as one unit. So, if you have brains on the brain, maybe neurological research is for you! There are countless mysteries in the animal brain just waiting to be solved.

Dumbest Animals In The World: Turkey


One of the dumbest birds, the Turkey, was first domesticated by the Aztecs.

The Meleagris, or turkey, is a beloved food at least once a year. Many enjoy them as pets. And the entire world knows how much the turkey deserves to be on any list of dumbest bird. They have widely-spaced eyes and an almost clumsy, dim-witted walk. Benjamin Franklin called them birds of courage. Animal Planet says theyre confused, while The Washington Post attests these animals are just misunderstood.

Owners who love the bird have spoken of their turkey preferring to only drink water that drips upward. This phenomenon is the result of the bird consuming rain as it falls from the sky. But theyre not drinking. They simply have a tendency of staring into the sky for up to 30 minutes at a time. When it rains, it appears the birds are simply mesmerized at the idea of wetness coming out of nowhere. So, they stare with their mouths open in awe. Often, they do so until they drown.

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Dumbest Animals In The World: Goblin Shark

One of the dumbest animals, the goblin shark, gets its name from a demon.

Sharks are generally known as creatures of reasonable intelligence. The average shark talks about the goblin shark behind its back. Not because the globins the black sheep of the family. Sharks think its the dumb one.

Found mostly off the coastlines of Japan, the goblin shark is sluggish. A hard task for a natural swimmer. Its also lazy. So lazy it wont hunt for food. The fish is also capable of being easy prey, letting predators walk right up and take it out. Behavior like that lands the goblin shark on any list of dumbest animals.

What Animals Have No Brains

Which animals do not have a brain?Jellyfish. The jellyfish family tree its called jellies. Corals. Just like the jellies, the corals are part of the Cnidarians family. Sea Sponges. Another fun fact about the sea sponge is that they can actually sneeze . Clams. Oysters. Sea Lilys. Sea Squirts.

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What Animal Has A Pea Sized Brain

According to the new study, Buriolestes schultzis brain had an elongated shape and weighed about 1.5 grams, as much as a pea, Tibi Puiu writes for ZME Science. Thats pretty small for an animal. For comparison, a similarly-sized fox has a 53 gram brain.

What Animal Has The Smallest Brain To Body Ratio

Why Pets Have Surprisingly Small Brains

Monitor lizards, tegus and anoles and some tortoise species have the largest among reptiles. Among birds, the highest brain-to-body ratios are found among parrots, crows, magpies, jays and ravens.Comparisons between groups.SpeciesBrain:body mass ratio small ants1:7small birds1:12mouse1:40human1:408 more rows

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Who Has The Smallest Human Brain

IndiaResearchers including those from IIIT Hyderabad developed the first Indian human brain atlas which revealed that India has some of the smallest brains in the world. The study found that there is a significant difference in the shape and size of the brain between Indians, Chinese, Koreans and Caucasians.

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