This ‘smoke’ ring was formed by one of the biggest creatures on Earth. Scientists say it has never been documented before
By Daniel Graham
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Scientists stunned to see humpback whales trying to send messages to humans
By Sheena Harvey
WhaleSETI: Curious Humpback Whales Approach Humans and Blow Bubble “Smoke” Rings
Watch Inquisitive Humpback Whales Blow Bubble Rings At Whale Watchers
By Eleanor Higgs
Scientists photograph whales blowing 'bubble smoke rings' to communicate with humans
By Eric Ralls
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Truth behind strange bubble 'smoke' rings seen around the world that could help search for aliens
By Joshua Nair