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Humpback whales are far better known for their bellowing "songs" that can travel up to six miles, but the animals also have quiet voices. Biologists have observed humpback calves “whispering” to their mothers in tones that can be heard only within 330 feet—a strategy to prevent predators, such as orcas, from eavesdropping. Calves also want to avoid adult male humpbacks, which may try to separate the calf from its mother to mate. This shortened time with its mom could ultimately weaken the calf, which needs to drink 50 gallons of milk a day to fuel up for its long migration.

Read more news.nationalgeographic.com

N7Y51 TIL a study of spiny lobsters showed they avoid others who've contracted an infectious disease called PaV1 that is transmitted by physical contact and which has a steady 7% infection rate in Florida waters. Spiny lobsters are very social and share communal dens but will shun infected individuals.
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8aPyX TIL In 1957, a terminal cancer patient was given a worthless drug that caused his tumors to “melt like snowballs on a hot stove.” When he found out it was proven worthless, his cancer returned. He was given a placebo version and it went away again. Got truth again and died.