SHARK VS SHARK

Horn sharkvsPacific 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.

LivingHeterodontus francisci×LivingSomniosus pacificus
QUICK VERDICT

Pacific sleeper shark is about 5.7× longer by these reference values.

Pacific sleeper shark uses a 7 m upper reference, compared with 1.22 m for Horn shark. Pacific sleeper shark's weight reference is about 91× heavier.

01

ON THE SAME SCALE

Human. Bus. Whale.
Pick your reference.

RELATIVE LENGTH · 0–24 METERS
AHorn sharkreported to 1.22 m / 4 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.

MeasureHorn sharkPacific sleeper shark
Length referencereported to 1.22 m / 4 ftreported near 7 m / 23 ft
Weight referencelarge-adult reference about 10 kg / 22 lblarge-animal estimate about 907 kg / 2,000 lb
Bite force128–338 N theoretical, depending on tooth positionModeledNo dependable maximum foundUnknown
HabitatRocky eastern Pacific reefsCold North Pacific, often deep
DietUrchins, crabs and mollusksFishes, squid, marine mammals and carrion
03

WHAT THE DATA CAN SAY

Size is not the whole animal.

Length and weight

Horn shark is represented by reported to 1.22 m / 4 ft; Pacific sleeper shark by reported near 7 m / 23 ft. Weight is a rounded adult reference. Large values often depend on indirect or incomplete records.

Bite evidence

Horn shark: Experiments also measured bites; the displayed range is the study's theoretical maximum from front to rear teeth. 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

Its rear teeth crush hard prey, and its bite mechanics have been tested directly and modeled. Rare encounters make its maximum size less certain than familiar coastal species.

04

TRACE THE CLAIMS

Sources and limits.

Horn sharkHuber et al. (2005)Pacific sleeper sharkAlaska Department of Fish and GameHow we standardize comparisonsRead the methodology →