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Image of the Day

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image: Image of the Day: Merging Blood Vessels

Image of the Day: Merging Blood Vessels

By | April 22, 2015

When blood vessels that are no longer needed are pruned, the cells making up the vessels fuse to prevent leakage, a process observed for the first time in vertebrates in zebrafish (pictured).

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image: Image of the Day: Dwindling Wolves

Image of the Day: Dwindling Wolves

By | April 21, 2015

In the 57th year of the world's longest-running predator-prey study, researchers found 1,250 moose and only three resident wolves—down from 24 in 2009—in Isle Royale National Park in Michigan.

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image: Image of the Day: Prolific Poplar

Image of the Day: Prolific Poplar

By | April 20, 2015

Researchers recently modified the cells of a poplar tree to divide more quickly.

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image: Image of the Day: Cracking Cavity

Image of the Day: Cracking Cavity

By | April 17, 2015

An MRI video of cracking knuckles reveals that the popping sound comes from the formation of a small air bubble (the dark cavity on the upper right image) in the synovial fluid of the joint.

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image: Image of the Day: Nitrogen Nodules

Image of the Day: Nitrogen Nodules

By | April 16, 2015

Rhizobium bacteria live in nodules on the roots of legumes like the hairy vetch (Vicia villosa) and convert atmospheric nitrogen into a form the plant can use to make essential molecules.

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image: Image of the Day: Out of the Woodwork

Image of the Day: Out of the Woodwork

By | April 15, 2015

Three new species of woodlizard, including Enyalioides sophiarothschildae (pictured), were recently discovered in the Andes.

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image: Image of the Day: Mosasaur Mom

Image of the Day: Mosasaur Mom

By | April 14, 2015

Recent analysis of baby mosasaur fossils long thought to be those of birds suggests that the extinct marine predators gave birth in the open ocean and not near the shore.

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image: Image of the Day: Hoo’s That?

Image of the Day: Hoo’s That?

By | April 13, 2015

Lar gibbons (Hylobates lar) produce different soft “hoo” calls to greet neighbors, sing duets with their mates, and warn each other about various predators.

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image: Image of the Day: Strong Skin

Image of the Day: Strong Skin

By | April 10, 2015

Collagen fibers that are normally curved stretch and straighten when skin is torn, preventing the tear from spreading.

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image: Image of the Day: Inside an Ammonite

Image of the Day: Inside an Ammonite

By | April 9, 2015

CT scans of hollow fossilized ammonites revealed that the invertebrates could have been buoyant enough to swim like their distant modern cousin, the nautilus.

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