A Common Thresher Shark, one
of three species of thresher sharks.
Half of the length of a thresher
is taken up by the tail, which the
sharks use to whack the small
fishes on which they feed.Photo by
Petter Lindgren, Wikimedia Commons, http:
//en.wikipedia.org/wiki/File:Threshershark.jpg
An aggregation of Scalloped Ham-
merheads. This species congregates
over seamounts by day in groups
that can number in the hundreds.
Individuals then move away from
the seamount to forage at night.
Photo by Seawatch.org, Wikimedia Commons,
http://en.wikipedia.org/wiki/File:Sphyrna
_lewini_school.jpg