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Pisces oscitancy , cough , and even burp . But they do n’t get choked up .

shout , allege Monterey Bay Aquarium ’s retired senior marine biologist Steve Webster , is an emotional response made only bybig - brained mammals .

Life’s Little Mysteries

This Atlantic wolffish does not seem to be the crying type.

moaner are " ego - aware and can excogitate upon past consequence , make projection about next outcome and engage in lots of other complex cognitive behaviors , " Webster said .

" Since fishes miss the parts of the brain that position us aside from the fishes — the intellectual cortex — I doubt very much that Pisces affiance in anything like crying , " Webster toldLiveScience . " And certainly they produce no binge , since their heart are constantly bathe in a weak culture medium . "

atlantic-wolffish-fish-110718-02

This Atlantic wolffish does not seem to be the crying type.

three cuttlefish in a tank facing each other

a woman yawns at her desk

Rig shark on a black background

a close-up of two rats nuzzling their heads together

a cat making a strange face with its mouth slightly open

A photo of the Xingren golden-lined fish (Sinocyclocheilus xingrenensis).

Researchers in the Weddell Sea were surprised to find 60 million icefish nests, each guarded by an adult and each holding an average of 1,700 eggs.

A goldfish drives a water-filled, motorized "car."

Great white sharks (Carcharodon carcharias) are most active in waters around the Cape Cod coast between August and October.

The ancient Phoebodus shark may have resembled the modern-day frilled shark, shown here.

A colorful blue and red betta fish against a black background.

A fish bone pierced a hole through a man�s intestine. Above, an X-ray showing the fish bone in the man�s gut, in the upper right corner of the image.

An image comparing the relative sizes of our solar system�s known dwarf planets, including the newly discovered 2017 OF201

an illustration showing a large disk of material around a star

a person holds a GLP-1 injector

A man with light skin and dark hair and beard leans back in a wooden boat, rowing with oars into the sea

an MRI scan of a brain

A photograph of two of Colossal�s genetically engineered wolves as pups.

Pelican eel (Eurypharynx) head.