The animal that has the highest pain tolerance is the naked mole rat.
Naked mole rats are very widely considered to be the animal that has the highest tolerance to pain.
A naked mole rat has the highest tolerance to pain as the naked mole rat has skin that completely lacks the neurotransmitters for certain types of inflammatory pain and chemical pain.
This allows the naked mole rat to swim in even acid and ignore the compounds that cause intense burning sensations.
Naked mole rats are a burrowing rodent native to the Horn of Africa and parts of Kenya, notably in Somali regions.
The naked mole rat is closely related to the blesmols and is the only species in the genus Heterocephalus.
Naked mole rats evolved their hairless, wrinkly skin to survive an exclusively underground lifestyle in the hot, dry soils of East Africa.
Without the need for sun protection or weather insulation, hair loss helps these naked mole rats, which are highly social animals prevent overheating while crowded together in deep, underground burrows.
Naked mole rats are essentially cold-blooded mammals that cannot regulate their body temperature the way we do.
Being hairless allows the naked mole rat to easily absorb warmth from shallow, sun-baked soil and quickly cool off when digging deep underground.
To stay warm at night, the naked mole rats huddle together in large, communal piles.
Because the naked mole rats spend 100% of their time underground, they don't face the sun exposure or wind that would require a protective coat of fur.
A thick coat of hair would trap dirt and create friction while the naked mole rats are moving through their complex, narrow tunnel systems and being hairless helps them navigate and move around much easier.
Though they appear hairless, the naked mole rats actually do have about 100 highly sensitive whisker-like hairs spread across their bodies to help them "feel" their way through the dark.
The naked mole rat also have specialized hairs between their toes to quickly sweep soil backward while digging.
Other animals that have the highest pain tolerance are the Tardigrade or water bear and the honey badger.
Tardigrade or water bears, operate on different biological mechanisms than mammals, although these animals, which are tiny and microscopic can also endure the vacuum of space, extreme radiation and even temperatures that are near absolute zero by entering a state of cryptobiosis.
And the honey badger, which is also an animal with the highest tolerance to pain, is famous for their legendary durability.
Honey badgers posses loose skin that is also incredibly thick, which shields the honey badger from any bee stings and venomous snake bites.
The incredibly thick and loose skins that honey badgers have, allows the honey badgers to shrug off neurotoxins and keep eating even amid swarms of insects.