Narwhal
The narwhal has two teeth, both at the tip of the upper jaw but usually only the left tooth develops. The resulting tusk
grows to more than three metres and is grooved on the surface in a
left-handed spiral. The undeveloped right tooth in males and usually
both teeth in females remain vestigial. On rare occasions two tusks may
develop in females as well as males. Although a variety of theories have
been proposed for the specific function of this tooth, recent
observations suggest that the males use their tusks in aggression
against one another as they compete for mates. The tusk was prized in
medieval times as the horn of the fabled unicorn.
Narwhal
Narwhal
Narwhal
Narwhal
Narwhal
Narwhal
Narwhal
Narwhal
No comments:
Post a Comment