Humpback whales off Chile

This 21 March 2020 video says about itself:

Humpback whales thrive off the tip of Chile

Humpback whales have found a safe haven on the tip of Chile. Bad weather means the region is relatively untouched by humans. Humpback whale populations have grown five-fold in Francisco Coloane Marine Park. Almost 20 years ago biologists only counted 40 individuals in the park. Now, they’ve counted 190.

Globally there are around 87 cetacean species, and conservation efforts to protect humpback whales have been among the most successful. Hunting humpback whales has been banned since the ‘60s.

Read more here.

Researchers recommend new guidelines for noise levels from whale-watching boats after having carried out experiments with humpback whales. They exposed the whales to different levels of boat-engine noises while observing the current guidelines for whale-watching — keeping 100 meters distance, for instance — while monitoring the whales’ behavior closely with a drone camera. The researchers concluded that the noise level from a boat’s engine should stay below 150 decibels: here.