The Biggest Kangaroos Evolved Long Arms to Fight Over Females

Male kangaroos and wallabies, like a lot of seemingly quiet grazing animals, get into knock-down drag-out fights over females. They obviously don’t have antlers or horns to spar with, but they’re perfectly willing to grapple rivals with their forelimbs and kick the crap out of each other with their big hind feet. » 7/01/15 9:00pm Wednesday 9:00pm

555 Million Years Ago, There Were Creatures That Looked Like You

Nothing looked exactly like you 555 million years ago, but that’s when life emerged that looked like you in one crucial respect. What’s the most basic thing that you share with some creatures and not others? Brains? Lungs? Red blood cells? Nope. It’s that you’re bilateral. You have the ability to be cut into two… » 6/18/15 9:53am 6/18/15 9:53am

Far From Sterile, Some Hybrids May Start New Species

Your schoolteachers probably told you most species wouldn’t (or maybe couldn’t) successfully interbreed with one another. If some did, their hybrid offspring, like mules, couldn’t have babies of their own. That explanation was a bit oversimplified. Hybridization happens, and it may be one way new species arise. » 6/09/15 6:30pm 6/09/15 6:30pm

Darwin Predicted This Animal's Existence Decades Before Its Discovery

Here’s a great Charles Darwin story you may not have heard before: In 1862, the famed naturalist foretold the discovery of an unusual animal, based on his observations of a species of orchid endemic to Madagascar. The creature was ultimately discovered in 1903—some 20 years after Darwin’s death. » 5/13/15 12:00pm 5/13/15 12:00pm

What Made the Y Chromosome So Tiny?

The Y chromosome, a chunk of genetic code that is unique to male mammals, isn’t just physically smaller than the X. It also contains far fewer genes. The X has more than 1000 genes, while the Y has fewer than 200 —and most of them don’t even work. Why do men have this odd, stunted chromosome in their genomes? » 5/07/15 7:40pm 5/07/15 7:40pm

They’re Calling This Adorable Creature The ‘Platypus’ Of Dinosaurs

Meet Chilesaurus diegosuarezi, a newly described dinosaur discovered by a seven-year-old boy in Chile. The theropod was related to famous meat-eaters like T. rex, but researchers think it was a vegetarian. Stranger still: It possessed a mixture of anatomical features unlike anything researchers have seen before.
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