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A Belgian forest turns blue before its canopy closes
Travel

A Belgian forest turns blue before its canopy closes

Each spring, bluebells carpet the floor of Hallerbos, creating a blue-purple layer beneath the trees. Visitors must stay on marked paths because footsteps…

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Poison frogs advertise a chemical defense with bright colors
Travel

Poison frogs advertise a chemical defense with bright colors

In toxic species, skin alkaloids can make an attack dangerous or unpleasant for a predator. Many of those compounds come from the frogs' diet, which helps…

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Australia’s gympie-gympie delivers venom through its leaves
Travel

Australia’s gympie-gympie delivers venom through its leaves

Tiny stinging hairs inject toxins that act on pain-signaling nerves. Researchers found that these plant toxins resemble some animal venoms in their structure…

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Some snake toxins struggle to latch onto a honey badger
Travel

Some snake toxins struggle to latch onto a honey badger

Researchers found changes in a muscle receptor targeted by snake neurotoxins. Those changes make it harder for particular toxins to bind and disrupt the…

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The candiru is a vampire of other fishes' gills
Travel

The candiru is a vampire of other fishes' gills

This small Amazonian catfish enters a larger fish's gill chamber and feeds on blood. There, delicate tissue and an active blood supply provide a very specific…

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The invisible tentacles hiding behind box jellyfish
Travel

The invisible tentacles hiding behind box jellyfish

Their nearly transparent tentacles can trail far from the jellyfish, and stinging cells in them deliver venom that can affect the heart.

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A banana bunch can look like shelter to a wandering spider
Travel

A banana bunch can look like shelter to a wandering spider

Brazilian wandering spiders hunt rather than sit in prey-catching webs, then seek sheltered places to rest. Dense leaves and bunches of fruit provide dark…

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Appalachian fireflies turn forests into light shows
Travel

Appalachian fireflies turn forests into light shows

Synchronous fireflies flash together, turning dark Appalachian woods into a pulsing light show that can make the forest seem to breathe.

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Oregon’s Thor’s Well swallows the incoming tide
Travel

Oregon’s Thor’s Well swallows the incoming tide

Water surges through the rocky opening as the tide comes in, creating the illusion of a bottomless drain. Getting too close can be dangerous.

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Romania has Europe's densest brown-bear population
Travel

Romania has Europe's densest brown-bear population

Romania has Europe’s densest brown-bear population, so hikes through its forests can take you into bear country.

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This dolphin has teeth for grabbing—and crushing
Travel

This dolphin has teeth for grabbing—and crushing

The Amazon river dolphin has pointed front teeth for catching prey and broader, ridged teeth farther back. Researchers link those rear teeth to tackling…

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An Austrian cave stores winter's cold for the thaw
Travel

An Austrian cave stores winter's cold for the thaw

Eisriesenwelt cools during winter, leaving rock and ice cold enough to freeze incoming meltwater in spring and early summer. Its ice formations grow from…

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Chilean marble caverns dissolve in turquoise lakes
Travel

Chilean marble caverns dissolve in turquoise lakes

Water erosion carved the marble into caves and pillars, which reflect the vivid turquoise water below.

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Winds in Patagonia can knock adults off their feet
Travel

Winds in Patagonia can knock adults off their feet

Gales funneled through Patagonia’s southern mountains can knock adults off their feet and rip doors from hinges, making tents difficult to pitch.

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Namibia's fairy circles turn missing grass into a repeating pattern
Travel

Namibia's fairy circles turn missing grass into a repeating pattern

Bare circles sit among grasslands, often with taller growth around their edges. Researchers test explanations involving water competition and termites, with…

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Romania put a lake inside a chamber carved out for salt
Travel

Romania put a lake inside a chamber carved out for salt

At Salina Turda, miners left a bell-shaped chamber roughly 90 meters high and 75 meters across. Water now covers about 80 percent of its floor, surrounding an…

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Why muddy shallows are dangerous around anacondas
Travel

Why muddy shallows are dangerous around anacondas

Anacondas can hide in cloudy shallows and ambush animals coming to drink, using their powerful coils to seize them.

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How acacia trees hire ants as bodyguards
Travel

How acacia trees hire ants as bodyguards

In return, the ants get hollow thorns to nest in and sugary nectar to eat. They attack herbivores that try to feed on the leaves.

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