Dolphins and Porpoises

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Dolphins & Porpoises

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Question 1

Dolphins are

A	fish.
B	mammals.
C	amphibians.

Question 2

What is the easiest way to tell a dolphin from a porpoise?

A	Dolphins have larger heads and longer snouts.
B	Dolphins have teeth but porpoises do not.
C	Porpoises have spots.

Question 3

It is thought that the dorsal fin on a dolphin's back

A	warns prey when dolphins are on the hunt.
B	is for decoration.
C	helps to balance the dolphin.

Question 4

Like bats, dolphins rely on

A	echolocation.
B	venom.
C	flight.

Question 5

Do dolphins make sounds below water?

A	No.
B	Yes, they make "creaky door" sounds underwater.
C	Yes, they "click" and make sounds too high for us to hear.

Question 6

Do dolphins use tools?

A	Yes, they use rocks to break open clams.
B	Yes, they use coral reefs to corner and capture fish.
C	Yes, they use reeds to lure fish out of caves.

Question 7

If a shark attacks, what is the most effective way dolphins can defend themselves?

A	By swimming away as fast as they can.
B	By surrounding the shark and ramming it in the belly with their noses.
C	By biting.

Question 8

Dophins are called

A	toothed whales.
B	baleen whales.
C	killer whales.

Question 9

How many different species are there in the dolphin family?

A	21
B	24
C	42

Question 10

How do dolphins keep saltwater from irritating their eyes?

A	Their eyes are protected by a jellylike substance.
B	They keep their eyes closed underwater.
C	They have an extra see-through eyelid on each eye.

Question 11

Using sonar, a dolphin can detect a fish the size of a minnow

A	from 10 feet away.
B	from 50 feet away.
C	from 50 yards away.

Question 12

How does a healthy dolphin help a sick dolphin?

A	The healthy dolphin catches fish for the sick dolphin.
B	The healthy dolphin supports the sick dolphin at the surface so it can breathe.
C	The healthy dolphin "sings" a whale song.

Question 13

The fold pattern in a dolphin's brain most closely resembles the brain folds of

A	humans.
B	chimpanzees.
C	hoofed animals.

Question 14

If you ever come across a stranded dolphin, what should you do?

A	Push it back out to sea.
B	Keep it wet and call an aquatic park for rescue.
C	Rub sunscreen lotion on it.

Question 15

Ancient fishermen thought it was a bad omen if

A	dolphins jumped alongside their boats three times.
B	dolphins rode waves.
C	dolphins got killed in the fishermen's nets.

Question 16

Dolphins are

A	cetaceans.
B	crustaceans.
C	barnacles.

Question 17

LIke all mammals, dolphins have hair. Where is it?

A	All their lives they have a few haris around their blowholes.
B	A birth there are a few whiskers around the mouth, which are soon lost.
C	They have eyelashes.

Question 18

What are flukes?

A	Flukes are another name for flippers.
B	Flukes are lucky events in a dolphin's life.
C	Flukes are the flat part of a dolphin's tail.

Question 19

How many nostrils do dolphins have?

A	Two
B	One
C	None

Question 20

Why do dolphins have such sharp teeth?

A	To grab and hold fish
B	To chew
C	To fight

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