SHARK VS SHARK

Common threshervsPacific sleeper shark

Length, weight and bite evidence—plus context from a human, city bus and blue whale. Every number below carries its uncertainty with it.

LivingAlopias vulpinus×LivingSomniosus pacificus
QUICK VERDICT

Common thresher is about 1.09× longer by these reference values.

Common thresher uses a 7.6 m upper reference, compared with 7 m for Pacific sleeper shark. Pacific sleeper shark's weight reference is about 2.7× heavier.

01

ON THE SAME SCALE

Human. Bus. Whale.
Pick your reference.

RELATIVE LENGTH · 0–24 METERS
ACommon thresherreported to 7.6 m / 24.9 ft
BPacific sleeper sharkreported near 7 m / 23 ft
REFAdult human1.8 m · about 80 kg

Length bars use upper comparison values and do not show body depth, tail proportion or typical adult size. A long thresher tail, for example, does not equal whale-shark body mass.

02

THE NUMBERS

Side by side.

MeasureCommon thresherPacific sleeper shark
Length referencereported to 7.6 m / 24.9 ftreported near 7 m / 23 ft
Weight referencerecorded over 340 kg / 750 lblarge-animal estimate about 907 kg / 2,000 lb
Bite forceNo dependable maximum foundUnknownNo dependable maximum foundUnknown
HabitatTemperate and tropical open watersCold North Pacific, often deep
DietSchooling fishes and squidFishes, squid, marine mammals and carrion
03

WHAT THE DATA CAN SAY

Size is not the whole animal.

Length and weight

Common thresher is represented by reported to 7.6 m / 24.9 ft; Pacific sleeper shark by reported near 7 m / 23 ft. Length comparisons can exaggerate body bulk because the tail is exceptionally long. Large values often depend on indirect or incomplete records.

Bite evidence

Common thresher: Its hunting performance cannot be reduced to jaw force. Pacific sleeper shark: No standardized maximum is available.

Living versus extinct

Both species are living, but record-sized individuals are rare. These upper references should not be read as normal adult size.

Ecology changes the matchup

Much of its length is tail, which it uses to stun prey. Rare encounters make its maximum size less certain than familiar coastal species.

04

TRACE THE CLAIMS

Sources and limits.

Common thresherFlorida MuseumPacific sleeper sharkAlaska Department of Fish and GameHow we standardize comparisonsRead the methodology →