It is rainy season, therefore the season for starting the growth cycle of some plants, in Costa Rica. It is always ant season here. Some of the trees we planted last year, mostly citrus varieties but also pomegranate, have become feasting locations for ants who devour their leaves and haul them off.
My assumption, seeing this constantly during the 25 years since we moved to Costa Rica, has always been that ants are primarily vegetarians So, today a bit of ant-wonk from a team of scientists at Harvard University, summarized on Phys.org’s website, to correct my assumption (the video alone is worth visiting the source article):
Army ants form some of the largest insect societies on the planet. They are quite famous in popular culture, most notably from a terrifying scene in Indiana Jones. But they are also ecologically important. They live in very large colonies and consume large amounts of arthropods. And because they eat so much of the other animals around them, they are nomadic and must keep moving in order to not run out of food. Due to their nomadic nature and mass consumption of food, they have a huge impact on arthropod populations throughout tropical rainforests floors. Continue reading
I have not acquired the book yet, but I have heard her discuss it and read an interview with her about it; the author has moved from reporting on extinction and climate phenomena to reporting on human intervention schemes that respond to those phenomena. The stories as told in the article below adhere to a claim Kolbert makes in her discussion with Ezra Klein, that as a journalist she is not in the judgement business:
An Australian project to help threatened marsupial species adapt to avoid predatory cats is among a host of ‘assisted evolution’ efforts based on the premise that it is no longer enough to protect species from change: Humans are going to have intervene to help them change.
Thanks to National Public Radio (USA) for this summary of a recent scientific study:
Hundreds of native North American plants, often dismissed as weeds, deserve a lot more respect, according to a new study. These plants, distant cousins of foods like cranberries and pumpkins, actually represent a botanical treasure now facing increased threat from climate change, habitat loss and invasive species.
The crops that the human race now depends on, including grains like wheat and tree fruit like peaches, originally were selected or bred from plants that grew wild hundreds or thousands of years ago. And those ancestral plants, like the small wild sunflowers that can be found across the United States, still exist. “If you see them growing along roadsides, those are the ancestors,” says Colin Khoury, a research scientist at the International Center for Tropical Agriculture. Continue reading
Thanks to Audubon Magazine we start 2020 with a short story about an adaptation that is not just pretty, but practical in more than one way:
Good for more than just attracting a mate, the clownish feature appears to keep the subpar fliers from overheating.
The puffin’s iconic orange bill might be its most recognizable feature, but it’s also quite functional, serving the charismatic seabird in all avenues of life. The bill’s large volume makes it a hefty food carrier, and its ultraviolet glow amps up puffins’ sex appeal. Now, scientists have identified yet another use of this dramatically curved bill: staying cool. Continue reading
The blurb from his own university’s news service is enough to catch your attention:
Drawing on advances in social science, evolutionary biology, genetics, neuroscience, and network science, “Blueprint” attempts to show how and why evolution has placed us on a humane path — and how we are united by our common humanity.
For too long, the author contends, scientists have focused on the dark side of our biological heritage: our capacity for aggression, cruelty, prejudice, and self-interest. But natural selection has given us a suite of beneficial social features, including our capacity for love, friendship, cooperation, and learning. Beneath all our inventions — our tools, farms, machines, cities, nations — we carry with us innate proclivities to make a good society.
There are not many reviews available yet, but here is one:
A social scientist looks at the good and bad sides of human character, arguing that we are evolutionarily inclined “to make a particular kind of society—a good one full of love, friendship, cooperation, and learning.”…
…A refreshingly optimistic view of our kind.
If, like me, you had previously only known of him due to this incident, the blurb and the review are catchy enough to warrant further attention. So I found an interview he recently gave (on a podcast I would not normally have sought out, but it was all I could find) and listening to him talk about it has made me want to find this book and have a read.
Hummingbirds are some of the most gemlike and visually striking birds in the “new world”, but those who have spent any time watching them know that striking can also be used as an apt verb to describe their behavior. Fiercely territorial, it’s not surprising that scientists are making more and more discoveries related to the evolution behind their development. (Click on image above to view the video)
Winsomely captured in poems and song, the birds are yielding new secrets about their astounding beaks and penchant for violence.
If you want to know what makes hummingbirds tick, it’s best to avoid most poetry about them.
Bird-beam of the summer day,
— Whither on your sunny way?
Whither? Probably off to have a bloodcurdling fight, that’s whither.
John Vance Cheney wrote that verse, but let’s not point fingers. He has plenty of poetic company, all seduced by the color, beauty and teeny tininess of the hummingbird but failed to notice the ferocity burning in its rapidly beating heart.
The Aztecs weren’t fooled. Their god of war, Huitzilopochtli, was a hummingbird. The Aztecs loved war, and they loved the beauty of the birds as well. It seems they didn’t find any contradiction in the marriage of beauty and bloodthirsty aggression.
Scientists understood that aggression was a deep and pervasive part of hummingbird life. But they, too, have had their blind spots. The seemingly perfect match of nectar-bearing flowers to slender nectar-sipping beaks clearly showed that hummingbirds were shaped by co-evolution.
It seemed clear that, evolutionarily, plants were in charge. Their need for reliable pollinators produced flowers with a shape that demanded a long slender bill. Hummingbird evolution obliged.
But hummingbirds also heard the call of battle, which demanded a different evolutionary course. Some of those slender, delicate beaks have been reshaped into strong, sharp and dangerous weapons.
In a recent paper organizing and summing up 10 years of research, Alejandro Rico-Guevara and his colleagues at the University of California, Berkeley, shared evidence gathered by high-speed video about how the deadly beaks are deployed in male-to-male conflict.
Like the horns of bighorn sheep or the giant mandibles of stag beetles, hummingbird beaks are used to fight off rivals for mates. This is sexual selection, a narrow part of natural selection, in which the improvement of mating chances is the dominant force. Continue reading
Thanks to JoAnna Klein a regular contributor for The New York Times Trilobites feature, for this:
By dosing the tentacled creatures with MDMA, researchers found they share parts of an ancient messaging system involved in social behaviors with humans.
Though interactive, they’re generally asocial, and temperamental, with unique behavior patterns, like those shown by Otto, who caused blackouts at a German aquarium and Inky, who famously escaped a tank in New Zealand.They learn through experience and observation, forming lasting memories with brain-like bundles of hundreds of millions of neurons in each arm and a centralized bundle in the middle.
A desire to understand the evolutionary underpinnings of this brain power led scientists to give octopuses ecstasy. Yes ecstasy — molly, E, MDMA, the party drug, which in humans reduces fear and inhibition, induces feelings of empathy, distorts time and helps people dance to electronic music all night. Continue reading
Science writing has been one of our favorite themes since we started this platform. The quality with which science is explained in clear language is good for the planet, we think. Carl Zimmer is probably the most cited science writer during these eight years, for good reason. The interview above from late 2016, if you are convinced about the importance of science writing, is about as good as it gets for hearing a master explain his craft in very personal terms. It was recorded just weeks after the most fateful (with regard to science) presidential election in recent USA history. Zimmer takes a “just the facts” approach to the interview, and neither punches, nor pulls punches, with regard to the environmental and other science policy mess-making that had just begun. He just shares his craft.
He has a new book out, which we have not read, but we are glad that it has brought him out on book tour. In the interview below, from just a couple weeks ago, we get a quick read on what he is saying now:
Carl Zimmer is a rarity among professional science writers in being influential among the scientists on whose work he writes and comments – to the extent that he has been appointed as professor adjunct in the department of molecular biophysics and biochemistry at Yale University. Zimmer has just published his 13th book, She Has Her Mother’s Laugh, a survey of “the power, perversions and potential of heredity”. Continue reading
At Gorongosa National Park, scarred by civil war, scientists are answering fundamental questions about ecology and evolution, and how wildlife recovers from devastation.
GORONGOSA NATIONAL PARK, MOZAMBIQUE — The 14 African wild dogs were ravenous, dashing back and forth along the fence of their open-air enclosure, or boma, bouncing madly on their pogo-stick legs, tweet-yipping their distinctive wild-dog calls, and wagging their bushy, white-tipped tails like contestants on a game show desperate to be seen.
Since arriving at the park three months earlier, as they acclimated to their new setting and forged the sort of immiscible bonds that make Lycaon pictus one of the most social mammals in the world, the dogs had grown accustomed to a daily delivery of a freshly killed antelope to feast on. Continue reading
It is true that elephants can smell. As in, be smelly. But they can also smell well, better than I knew. Yesterday’s elephant mention was the first in a long time, reminding us how frequently we posted about them from India. When we were in the land of elephants, and other charismatic megafauna, we ran stories frequently about their mega-wondrousness. Now, a welcome reminder about how amazing these big creatures are in smaller ways too. Click above to go to the video accompanying this story below by James Gorman:
In the world of noses, the elephant’s trunk clearly stands out for its size, flexibility, strength and slightly creepy gripping ability.
Go ahead, try to pluck a leaf with your nostrils and see how you fare. So perhaps it should come as no surprise that the elephant’s sense of smell is also outstanding. Continue reading
Thanks as always to James Gorman, one of the best illuminators of any variety of natural mysteries who we never tire of citing in these pages. He tells funny stories sometimes, about beautiful as well as awesome phenomena that we want to know. And he knows how to tell it:
Researchers say bees understand the concept of nothing, or zero. But do we understand what that means?
What would it mean if bees could understand the concept of nothing?
That would be really something.
Yet that is what scientists reported Thursday in the journal Science. Bees had already demonstrated they could count. Now, the researchers wrote, bees have shown that they understand the absence of things — shapes on a display in this experiment — as a numerical quantity: none or zero.
This is a big leap. Some past civilizations had trouble with the idea of zero. And the only nonhuman animals so far to pass the kind of test bees did are primates and one bird. Not one species, one bird, the famed African gray parrot, Alex, who knew not only words, but numbers. Continue reading
We never think of evolution as particularly predictable. Surprising, yes. Awesome, yes. Predictable? Well, we love science for that reason, but still do not associate evolution with predictability. Thanks to Ed Yong, who enjoys making provocative statements that draw his reader in, for making evolution surprising in a new way:
On each Hawaiian island, stick spiders have evolved into the same basic forms—gold, white, and dark. It’s a stunning example of how predictable evolution can be.
Most people go to Hawaii for the golden beaches, the turquoise seas, or the stunning weather. Rosemary Gillespie went for the spiders.
Situated around 2,400 miles from the nearest continent, the Hawaiian Islands are about as remote as it’s possible for islands to be. In the last 5 million years, they’ve been repeatedly colonized by far-traveling animals, which then diversified into dozens of new species. Honeycreeper birds, fruit flies, carnivorous caterpillars … all of these creatures reached Hawaii, and evolved into wondrous arrays of unique forms. Continue reading
CONGERS, N.Y. — Of all the coyotes that roam Dr. Davies Farm, looking for prey on this apple-picking orchard less than an hour from New York City, manager James Higgins says one of the pack stands out: Bigger and with more gray fur than its mates, this wolflike canine is a reason, Mr. Higgins says, there are fewer deer nibbling at Dr. Davies’s stock.
“We love having him here,” Mr. Higgins said as he drove around the property on an ad hoc coyote safari. There were no sightings, but Mr. Higgins ventured a profile of the creature: aloof, calm, uninterested in people.
“Anytime he sees any kind of human activity, he bolts,” Mr. Higgins said. “As long as he stays in his space and we stay in ours, everyone works in harmony.” Continue reading
Out of the roughly 250 bird families in the world, manakins (Pipridae family) are probably my favorite, because they’re like birds of paradise (Paradisaeidae family), except you don’t have to take a helicopter to remote areas of Papua New Guinea to see them. Almost all manakins are colorful––or at least the males are; females normally being a drab green––and they often have interesting behavior as well. I saw my first manakins in Ecuador, where two flashy species had some fun sounds to go along with their calls, but most of my exposure to the family has been in Costa Rica, where I did my best to record a Long-tailed Manakin lek.
The 57 million-year-old fossil is both fearsome and comical: a long-beaked penguin that stood 5 feet 7 inches tall and weighed about 220 pounds.
“It was as tall as a medium-sized man,” said Gerald Mayr, a paleontologist at the Senckenberg Research Institute in Frankfurt, Germany, and lead author of a report in Nature Communications on Tuesday announcing the discovery.
By comparison, the tallest living species, the emperor penguin, reaches about four feet in height. Kumimanu biceae, as the fossil was named, would have towered above the emperor, and above just about all other known ancient penguins. Continue reading
Conservationists have been sounding the alarm over invasive species for years, warning of the damage they can cause to habitats and native animals. But in Florida, an invasive snail might be helping an endangered bird species come back from the brink, researchers say.
The population of North American snail kites — birds that use curved beaks and long claws to dine on small apple snails in the Florida Everglades — had been dwindling for years, from 3,500 in 2000 to just 700 in 2007. Things began to look particularly bleak in 2004, when a portion of the Everglades was invaded by a species of larger snail that the birds had historically struggled to eat. Ornithologists assumed the shift would hasten the snail kite’s decline. Continue reading
Thanks to the Trilobites feature on the New York Times website for this story of collaborative friendliness between species:
Chances are that’s a shy elk looking back at a bold magpie, in the photograph above.
They get along, so to speak, because the elk needs grooming and the magpie is looking for dinner. But they may have never entered into this partnership if it weren’t for their particular personalities, suggests a study published Wednesday in Biology Letters.
Let’s start with the elk. In Canada’s western province of Alberta, they’ve been acting strange. Some have quit migrating, opting to hang around towns with humans who protect them from predators like wolves. Others still migrate. Continue reading
Camera traps, in the interest of science, and of conservation, are no longer a novelty. The story accompanying the photo above is new, for us. At first glance it looks like an act of aggression, which the history of whaling has taught us to expect. But this story has a much better outcome than the old obsessions:
This is how you put a video camera on a whale.
Hop into an inflatable boat and head out to where they’re feeding. Stand in a pulpit with a 20-some-foot pole in your hands. Then watch and wait until you spot a whale. Plan your angle of approach with the driver of the boat. (Never approach directly from behind). Get close. Get closer. Get within 16 feet of this sea giant — which is more than twice the size of your boat if it’s a humpback — and as soon as it surfaces, tap the whale on its wet tire of a back with the pole. If you’re lucky, the detachable suction-cup on the end of the pole — which has a camera and sensors — will stick. Continue reading
Animal spotted by photographer in jungles of southern India may be the fairest known tiger living outside captivity