An anonymous reader quotes a report from The New York Times: The medal awarded on Friday lauded the "lifesaving bravery and devotion to duty" for work detecting land mines in Cambodia. Its recipient: a rat named Magawa. Magawais the first rat to receive the award -- a gold medal bestowed by the People's Dispensary for Sick Animals, a British charity, that is often called the "animal's George Cross" after an honor usually given to civilians that recognizes acts of bravery and heroism. Not since the fictional Remy of the 2007 Disney-Pixar film "Ratatouille" has a rat done so much to challenge the public's view of the animals as creatures more commonly seen scuttling through sewers and the subway: Magawa has discovered 39 land mines and 28 pieces of unexploded ordnance, and helped clear more than 1.5 million square feet of land over the past four years. More than five million land mines are thought to have been laid in Cambodia during the ousting of the Khmer Rouge and internal conflicts in the 1980s and 1990s. Parts of the country are also littered with unexploded ordnance dropped in United States airstrikes during the Vietnam War, a 2019 report from the Congressional Research Service found. Since 1979, more than 64,000 people have been injured by land mines and other explosives in Cambodia, and more than 25,000 amputees have been recorded there, according to the HALO Trust, the world's largest humanitarian land mine clearance charity. Magawa, the most successful rat to have taken part in the program, was trained to detect TNT, the chemical compound within explosives. The ability to sniff out TNT makes him much faster than any person in searching for land mines, as he can ignore scrap metal that would usually be picked up by a metal detector. He can search an area the size of a tennis court in 30 minutes, whereas a person with a metal detector would usually take four days to search an area of that size. When he finds a mine, he signals to his handler by scratching at the earth above it. Unlike humans, Magawa is too light to detonate a mine, so there is minimal risk of injury.

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Research unveiled on Thursday in Science finds that crows know what they know and can ponder the content of their own minds, a manifestation of higher intelligence and analytical thought long believed the sole province of humans and a few other higher mammals. STAT reports: "Together, the two papers show that intelligence/consciousness are grounded in connectivity and activity patterns of neurons" in the most neuron-dense part of the bird brain, called the pallium, neurobiologist Suzana Herculano-Houzel of Vanderbilt University, who wrote an analysis of the studies for Science, told STAT. "Brains can appear diverse, and at the same time share profound similarities. The extent to which similar properties present themselves might be simply a matter of scale: how many neurons are available to work." The study shows that neurons in the most complex part of the crows' brain, the pallium, "do have activity that represents not what was shown to them, but what they later report," said Herculano-Houzel. Neurons "represent what the animals next report to have seen -- whether or not that is what they were shown," she said. The neurons figure this out, so to speak, during the time lapse between when Nieder tells the birds the rule and when they peck the target to indicate their answer. "That's exactly what one would expect from neurons that participated in building the thoughts that we later report," she said, suggesting that corvids "are as cognitively capable as monkeys and even great apes." A second study, also in Science, looked in unprecedented detail at the neuroanatomy of pigeons and barn owls, finding hints to the basis of their intelligence that likely applies to corvids', too. STAT reports: Specifically, the pigeons' and owls' neurons meet at right angles, forming computational circuits organized in columns. "The avian version of this connectivity blueprint could conceivably generate computational properties reminiscent of the [mammalian] neocortex," they write. "[S]imilar microcircuits ... achieve largely identical cognitive outcomes from seemingly vastly different forebrains." That is, evolution invented connected, circuit-laden brain structure at least twice. "In theory, any brain that has a large number of neurons connected into associative circuitry ... could be expected to add flexibility and complexity to behavior," said Herculano-Houzel. "That is my favorite operational definition of intelligence: behavioral flexibility." That enables pigeons to home, count, and be as trainable as monkeys. But for sheer smarts we're still in the corvid camp.

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