Reading 13: Baleen Whales

READING 13

You should spend about 20 minutes on Questions 1 – 10 which are based on Reading 13.

Baleen Whales

A         Baleen whales are the largest animals on earth, yet they feed on some of the smallest animals in the ocean. There are 12 baleen whale species divided into 4 families: right, pygmy right, gray and rorqual whales.

B         Right whales were called the "right" whales to catch by early hunters because they are large, swim slowly, have long baleen plates, contain lots of oil, and float when killed. Right whales do not have dorsal fins or throat grooves. The taxonomy of this family is rather confusing, but currently there are three species of right whales: the Northern right whale, Southern right whale and bowhead whale. The pygmy right is in a separate family although it shares similarly characteristics to right whales.

C         Gray whales have their own taxonomic family, genus, and species. They are the most coastal of the baleen whales and are often found within a few miles of shore. Each year gray whales migrate between their summer feeding grounds in the Bering, Chukchi, and Beaufort Seas to their winter breeding grounds off Baja California, Mexico. This is one of the longest migrations by a mammal species. Gray whales are gray in color and their skin is encrusted with barnacles and a unique species of small crustaceans known as "whale lice." They have 2-3 short throat grooves and instead of a dorsal fin they have a low dorsal hump followed by 6-12 "knuckles" or bumps. Whalers used to call gray whales "devil fish" because of their aggressive response to being hunted.

D         Rorqual whales are relatively streamlined in appearance and have pointed heads and small pointed fins. They can be distinguished from other whales by many (25-90) deep groves along their throats that expand when they feed. There are 8 species of rorqual whales: the humpback whale, fin whale, Bryde's whale, blue whale, northern minke, antarctic minke, Eden's ("small-type") whale.

E          Baleen whales are some of the largest animals on earth. Characteristic baleen plates and paired blowholes help distinguish baleen whales from toothed whales. All cetaceans have a long, strong diaphragm which allows them to rapidly exhale as they surface and quickly inhale before submerging. The phrase "Thar she blows!" was coined by whale hunters who spotted the column of vapor as the whales exhaled.

F          How were baleen whales named? Baleen whales were named for the long plates of baleen which hang in a row (like the teeth of a comb) from their upper jaws. Baleen plates are strong and flexible; they are made of a protein similar to human fingernails. Baleen plates are broad at the base (gumline) and taper into a fringe which forms a curtain or mat inside the whale's mouth. Baleen whales strain huge volumes of ocean water through their baleen plates to capture food: tons of krill, other zooplankton, crustaceans, and small fish.

G         Early humans hunted whales for food and oil. But in the 19th and early 20^th centuries, before the invention of plastic, whales were hunted commercially for their baleen or "whalebone" as well as for their oil. The whalebone was used to make women's corsets, buggy whips, and umbrella ribs. Most baleen whale species remain severely depleted because of this commercial whaling.

Questions 1 – 5

Complete the table below. Use NO MORE THAN THREE WORDS from the passage.

Write your answers in boxes 1 – 5 on your answer sheet.

B A L E E N W H A L E S	Right	… 2 …
		Southern right
		… 3 …
	Pigmy right
	… 1 …	genus
		species
	Rorqual	humpback
		fin
		Bryde's
		… 4 …
		Northern minke
		… 5 …
		Eden‘s

Questions 6 – 8

Answer questions 6 – 8 using NO MORE THAN FIVE WORDS from the passage. Write your answers in boxes 6 – 8 on your answer sheet.

6. What whales are the largest on earth?

7. Before commercial whaling started in the 19th and early 20th centuries, what did early

humans hunt whales for?

8. What did baleen whales feed on?

Questions 9 – 10

Choose the appropriate letters A – D and write your answers in boxes 9 – 10 on your

answer sheet.

9. Right whales are called right whales because they …

A. float when killed.

B. have long baleen plates

C. are large.

D. are thought as the right whales to catch by the hunters.

10. Sharing characteristics similar to the right whales, the pygmy right is …

A. a member of the right whale family.

B. in a separate family.

C. younger than white whales

D. more powerful than other whales.