A letter from Australia
Are sharks mindless killing machines? A Science Question 13
SWIMMING WITH SHARKS
Swimming with sharks
: Great White Sharks
Where do the great white sharks in the documentary come from?
off the coast of South America.
off the coast of North America.
off the coast of South Australia.
off the coast of South Africa.
off the coast of Japan.
Some characteristics about great white sharks:
• Great white sharks can reach
feet in length.
• They can weigh up to
• They can sprint through the water at speeds up to
miles per hour.
: 1 foot = 30.48 cm
1 pound = 0.454 kg
1 mile = 1.609 km
• Great white sharks have great
• They are
• They love to
things that get their attention
• They like to eat humans:
• Great white sharks feel about humans the way most humans feel about
They are something to eat out of
• Great white sharks
humans for the same reason they
other things like
Learn about the
ampullae of Lorenzini
ampullae of Lorenzini
found all around the shark's
(= nose) and
. That means
that anything that gives off the tiniest (= smallest)
has to be
in the sea.
Great white sharks like to eat seals. What are seals compared to in the documentary?
Seals are a double
: Whale Sharks
Learn about some characteristics of the whale shark!
• The whale shark is
shark in the ocean.
• The whale shark can measure up to
• The whale shark can weigh over
• The whale shark is more than
times the size of the great white shark.
• The whale shark has
teeth but they are
and of little use.
What does the whale shark eat to survive?
a dog snapper
The spawning ritual of the dog snappers
: At the top of the parade loop, the
, which leads to whale shark chow (= slang for food).
The whale shark is what is called a
feeder. As it swims with its huge
open, prey like these dog snapper eggs gets trapped in rakers, while water is expelled right
back out through the gills. But dog snapper eggs are not the only
these big mouths love to
: Bull Sharks
There are only 3 sharks that regularly attack humans: the massive great white shark, the tiger shark and
the bull shark.
What is the other name given to the bull shark?
The bull shark is also called the
of the seas.
Learn about some characteristics of the bull shark!
• The bull shark can be
• Bull sharks are not as large as the great white but female bull sharks can grow over
• Female bull sharks can weigh up to
• Bull sharks also have a very special characteristic: they can go from
no problems. Bulls have been found thousands of miles upstream in both the
• Bull sharks are opportunistic
: they'll eat just about anything.
Crittercam is a small package of instruments including a camera that can be attached to a wild
animal to study its behaviour in the wild. What does the camera reveal about the bull shark?
• The Crittercam reveals at least
in the region, which raises the intriguing possibility
that these sharks may be
• Satellite data also confirmed that the bulls
. These animals may be an important part of
People must remember something about bull sharks:
They are more likely to get