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Some Trinidadian guppies are far braver than others.
Sleep could be as old as life itself.
This hermit crab is no hobo.
Sorry, bro.
Only two genes code both the canvas and paintbrush for the intricate butterfly wing patterns.
This is an abnormally strong hurricane season.
It bit with the force of wolves or female tigers.
This is the first time that anyone has compiled a full list.
More research needs to be done.
Damn, it always sucks when you come in second.
Big and small animals are the most threatened by extinction.
Ever wondered what an octopus city looks like?
It's quickly following in Irma's footsteps.
It's like getting tasered -- nine times. At the same time. Professor Catania has the measurements to prove it.
Teach a man to chemically process sawdust into the building blocks of life to feed his fish, and you feed him for a lifetime.
The author wishes this photo 'didn't exist'.
The connection to climate change is more intricate than you'd think.
The intelligent animals have responded to poaching by shifting their foraging patterns.
Gone with the wind.
Is it really that bad?
Time to make amends, VW.
Like the all-seeing eye, Bresnik takes impressive photos of ungodly storms.
Stabby stabby!
Parasites are a hard sell, but we would certainly gain a lot by understanding their threats.
It's pretty simple math.
What's real, a gruffalo, or a hirola?
Our thoughts go to the victims.
It's literally everywhere.
Plants too experience internal nutrient traffic jams, and they're fantastic at responding to them.
Someone send Samsung the memo.
Crack open a nutty one.
A great move for the Scotts.
The northern lights might be a brilliant spectacle for some, but they spelled doom for some unfortunate sperm whales.
Everything is bigger in Texas -- floods and pollution included.
These are some brilliant entries.
You could say she... manurefactures them.
A popular Japanese flower was used to demonstrate the power of CRISPR.
Soon to be the ex-largest inland lake on Earth.
A unique place is in danger. Here's how to pitch in.
Otters are copycats.
There's also some bad news...
It's like spinning gold from straw.
A new study overturns a classic textbook theory.
It could start a self-reinforcing loop.
It's the stuff of nightmares.
Sure, we think chimps are clever -- but never as clever as us.
Being lonely makes you more desperate.
We're literally eating the viability of tomorrow's oceans.
It's high time we do something to protect them.
We've found it, but we may soon lose it again to hunting.