The migration behavior of humpback whales has long puzzled scientists. While the provided reading presents three theories regarding how these whales manage to undertake long-distance migrations, the lecturer offers a contrasting viewpoint with an additional set of three arguments.
Firstly, the notion of humpback whales navigating by using stars is highlighted in the reading as a sign of their astuteness. However, the lecturer disputes this by suggesting that the possession of this ability does not necessarily connote intelligence. The lecturer posits that animals’ cognitive abilities and instincts play a pivotal role in their navigation systems, as evidenced by birds using stars to navigate long distances. However, the absence of empirical evidence to support the idea that humpback whales navigate using stars is a significant gap in this argument.
Secondly, the reading asserts that humpback whales are capable of migration in straight lines by utilizing external objects for guidance. Conversely, the lecturer refutes this claim by pointing out that it is the Earth’s magnetic field that compels these magnetically sensitive animals to follow specific directions, rather than relying on external objects such as stars.
Finally, the reading posits that the observation of the environment from the surface of the water is indicative of how humpback whales navigate during their migration. However, the lecturer contests this assertion by highlighting that, while it may be a unique behavior, other animals with similar features, such as sharks, do not migrate, even though they also observe their environment from the water’s surface. The lecturer emphasizes that sharks engage in surface observations solely for hunting purposes, and not for following celestial objects like stars.
In conclusion, the arguments presented by both the reading and the lecturer offer contrasting perspectives on the mechanisms of humpback whale migration. The absence of concrete evidence for the use of stars in navigation, the significance of Earth’s magnetic field, and the distinct behaviors exhibited by other marine animals all contribute to the ongoing debate regarding the migratory behaviors of humpback whales.