Sightings of humpback whales off Rio de Janeiro's coast are surging as they recover from decimation due to commercial whaling, prompting an acceleration in the demand for whale-watching excursions.

Sightings of humpback whales off Rio de Janeiro's coast are surging as they recover from decimation due to commercial whaling, prompting an acceleration in the demand for whale-watching excursion

Humpback whales are increasingly spotted off Rio de Janeiro as their population recovers from past commercial whaling.