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What makes a firefly glow

The firefly is probably the Earth's most famous bioluminescent species, with over 2,000 individual species. Here's how they make their light.
What makes a firefly glow
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What’s inside a human ear

Your ears are responsible for more than just hearing; they keep you balanced, control facial features and help your taste, thanks to what's inside.
What’s inside a human ear
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What’s inside an elephant trunk

Elephant trunks are the most impressive noses in the animal kingdom. Almost entirely muscle, trunks lift hundreds of pounds and sniff out landmines.
What’s inside an elephant trunk
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What’s inside a blobfish, the ‘world’s ugliest animal’

The blobfish was crowned the world’s ugliest animal in 2013 – a title it still defends today. But drop this fellow 9,200 feet below sea level, and the water holds up all that flab like a push-up bra, making the fish a little more handsome. Between the skin and the […]
What’s inside a blobfish, the ‘world’s ugliest animal’
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What’s inside a rattlesnake’s tail?

A rattlesnake’s rattle doesn’t work like a maraca to make that distinctive sound-instead, the outer shell of the rattle, which is made of keratin, clicks together. The snake uses special shaker muscles to vibrate the tip of its tail up to 90 times a second. As the snake sheds its […]
What’s inside a rattlesnake’s tail?
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What’s inside a firefly

There are over 2,000 individual firefly species, all within the taxonomic family of Lampyridae. But the answer to the lightning bug’s light all happens in the same organ in its abdomen: the lantern. These light cells are encased in a translucent exoskeleton, and hold two key components to bioluminescence: luciferin […]
What’s inside a firefly
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What’s inside a human ear

Ears are arguably one of the most important features of the body and a defining feature for most of us. But they don’t just control our hearing, there’s a lot more going on inside. They are essential to our balance and ability to walk. They help with controlling your facial […]
What’s inside a human ear
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What’s inside a puffer fish

Puffer fish are best known for their ability to inflate like a balloon, but if you peer inside, you typically won’t find air. You’ll find water. Puffer fish inflate by sucking water into their mouths and then pumping it into their stomach, which inflates like an accordion. Parts of the […]
What’s inside a puffer fish
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What’s inside a clam?

Like oysters, mussels, and scallops, clams are bivalve mollusks – aquatic invertebrates encased by a shell made of two valves. Inside their shell, you’ll find some truly bizarre anatomy. They have a retractable foot, for example, which they use to bury themselves underground. Research has shown that razor clams can […]
What’s inside a clam?
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What’s inside a caterpillar cocoon

Contrary to popular belief, a chrysalis is not a pouch or a sac with a caterpillar inside. During metamorphosis, the former caterpillar releases digestive juices that rip apart and dissolve cells in its muscles, digestive system, and other organs. Then, special groups of cells called imaginal discs divide over and […]
What’s inside a caterpillar cocoon