Humpback

Question 1

Humpback length

Answer 1

40-50ft, females longer, reverse sexual dimorphism

Question 2

Weight

Answer 2

60,000-90,000lb or 30-45 tons

Question 3

Tail width

Answer 3

13-18ft

Question 4

Pectoral flipper length

Answer 4

13-16ft

Question 5

Length at birth

Answer 5

12-15ft

Question 6

Weight at birth

Answer 6

1,500-2,000lb

Question 7

Lifespan

Answer 7

70-100years

Question 8

Sexual maturity

Answer 8

6-8years

Question 9

Diet

Answer 9

Krill small fish herring

Question 10

Number population segments

Answer 10

14

Question 11

How many whales in 1966

Answer 11

1,500-2,000 in central n pacific

Question 12

How many whales now

Answer 12

20,000+ in central n pacific

Question 13

How long is total yearly migration

Answer 13

6,000

Question 14

Why cold water in summer

Answer 14

Warm waters do not hold onto dissolved oxygen as well so are not as productive / there isn’t as much food there

Question 15

How much body weight can humpbacks lose in summer

Answer 15

Up to 1/3

Question 16

Why do they leave Ak for winter

Answer 16

Avoiding predator species of transient orcas

Question 17

What is the survival rate for 1st year of humpback life

Answer 17

70%

Question 18

What is baleen made of

Answer 18

Keratin

Question 19

How many baleen plates

Answer 19

400

Question 20

How big is humpback throat

Answer 20

15in - about the size of grapefruit

Question 21

What is a temporary whale gathering called

Answer 21

Gam

Question 22

How long is a typical dive

Answer 22

5-7mins

Question 23

How long can humpbacks hold breath

Answer 23

Almost an hour

Question 24

Record humpback depth dive

Answer 24

2,021 ft

Question 25

Avg humpback dive depth

Answer 25

700ft

Question 26

How is humpback skeletal structure adapted to diving

Answer 26

Tiny and irrelevant sternum gives ribs extra flexibility along w angle and flexible jointer --> lets them collapse lungs on a deep dive

Question 27

Explain whale sleeping

Answer 27

Whales are conscious breathers --> voluntary breath at surface, hemispheric resting lets them stay partly conscious and have 1/2 of brain asleep at time for periods of 15-40 mins and 2-5hrs per day --> behavior called logging

Question 28

How long is gestation period

Answer 28

11-12months fitting w migration timeline

Question 29

How often do they reproduce

Answer 29

2-4yrs

Question 30

What percent milk fat is mothers milk

Answer 30

50% (human is 3-4%)

Question 31

How much milk consumed per day

Answer 31

Over 100 gallons gaining 80-100lb per day

Question 32

Primary threats

Answer 32

Ship strikes and entanglement in fishing gear, also acoustic disturbance, climate change, stress from rec vessels and ocean debris