Today in our marine biology lecture, we'll discuss the migration patterns of the humpback whale. These whales travel up to 16,000 kilometers each year from cold feeding grounds to warm breeding waters. Interestingly, they navigate using the Earth's magnetic field, but recent studies show that ocean currents also play a key role. For example, a 2023 tracking project found that whales often take advantage of strong currents to save energy, reducing their travel time by up to 20%. However, this strategy can be risky if currents shift due to climate change, potentially leading them off course. So, while magnetic fields provide a general direction, currents refine their route.
❓ According to the lecture, what did the 2023 tracking project reveal about humpback whales?
A. A. They rely solely on the Earth's magnetic field for navigation.
B. B. They use ocean currents to reduce travel time by about 20%.
C. C. They migrate only short distances between feeding and breeding areas.
D. D. Climate change has already caused them to change their migration routes.
✅ 正确答案
B. They use ocean currents to reduce travel time by about 20%.