Jul 21, 2017

Elephant seals recognize signature calls

Mathevon et al. 2017

A new study found male northern elephant seals produce signature rhythmic calls to communicate with their rivals — and navigate their social network.

Why it matters: These are the only non-human mammals known to use rhythm, and the evolution of this type of communication in other species helps to better understand the origins of music among humans.

How they use it: Nicolas Mathevon, one of the study's authors from Université de Lyon/Saint-Etienne in France, said elephant seals "fight [for females] very violently, even to the point of killing one another." Recognizing competitors by the rhythm in their voice allows them to "choose the right strategy" when confronting a rival during mating.

Yes, but... seals most likely use "a multitude of factors to identify each other in a group," not just their calls, according to Caroline Casey, a PhD candidate at the University of California Stanford who participated in the study.

What comes next: Casey said the team is "in the process of tracking young elephant seals throughout their vocal development to see how these individual signatures emerge over time."

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In photos: India welcomes president with massive "Namaste Trump" rally

First Lady Melania Trump, President Trump and India's Prime Minister Narendra Modi attend the "Namaste Trump" rally at Sardar Patel Stadium in Motera, on the outskirts of Ahmedabad, on Monday. Photo: Mandel Ngan/AFP via Getty Images

President Trump told a massive crowd at a rally in Ahmedabad, northwest India, Monday he hopes to reach a trade deal with his ""true friend" Prime Minister Narendra Modi during his two-day visit to the country "except he's a very tough negotiator."

Why it matters: The countries are forging deeper ties, particularly in the military dimension, as India’s location, size and economic growth making it the "obvious counterweight to China" for American policymakers, per Axios' Dave Lawler and Zachary Basu. Prime Minister Narendra Modi demonstrated the importance of the visit with a "Namaste Trump Rally" at a packed 110,000-capacity Sardar Patel Stadium in Ahmedabad — the world's largest cricket venue.

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Coronavirus spreads to more countries as cases in South Korea surge

Data: The Center for Systems Science and Engineering at Johns Hopkins, the CDC, and China's Health Ministry. Note: China numbers are for the mainland only and U.S. numbers include repatriated citizens.

Afghanistan, Kuwait and Bahrain each reported their first cases of the novel coronavirus, Al Jazeera first reported, as infections in South Korea, Italy and mainland China continued to increase on Monday.

The big picture: As South Korea and Italy stepped up emergency measures in efforts to thwart the spread of the virus, World Health Organization officials expressed concern about infections with no clear link to China. COVID-19 has killed at least 2,619 people and infected almost 80,000 others, with all but 27 deaths occurring in mainland China.

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Sanders reveals free childcare plan for preschoolers

Democratic presidential candidate Sen. Bernie Sanders speaks during a campaign rally on Saturday in El Paso, Texas. Photo: Cengiz Yar/Getty Images

Democratic presidential candidate Sen. Bernie Sanders announced on CBS' "60 Minutes" Sunday a new plan to guarantee free child care and pre-kindergarten to all American children from infancy to age four.

Details: In the wide-ranging interview, Sanders told Anderson Cooper he planned to pay for universal childcare with a wealth tax. "It's taxes on billionaires," he said.

Go deeperArrowUpdated 6 hours ago - Politics & Policy