Image of the Day

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image: Image of the Day: Ninja Tortoise

Image of the Day: Ninja Tortoise

By | November 3, 2015

The eastern Santa Cruz tortoise (Chelonoidis donfaustoi) was classified as a new species of Galápagos tortoise last month after genetic analyses separated it from the western Santa Cruz tortoise (C. porteri).

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image: Image of the Day: Killer Companions

Image of the Day: Killer Companions

By | November 2, 2015

Engineered T cells (purple) release nanoparticles (yellow) to recruit neighboring T cells in this assault on melanoma tumor cells (green).

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image: Image of the Day: Eager Explorers

Image of the Day: Eager Explorers

By | October 30, 2015

A colony of Argentine ants (Linepithema humile) investigating an empty arena left pheromone trails in these estimated patterns.

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image: Image of the Day: Red Rarity

Image of the Day: Red Rarity

By | October 29, 2015

The i’iwi, or scarlet Hawaiian honeycreeper (Drepanis coccinea), is one of many rare birds threatened by climate change in Hawaii’s higher elevation forests.

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image: Image of the Day: Record-Breaking Beetle

Image of the Day: Record-Breaking Beetle

By | October 28, 2015

The smallest known free-living insect, Scydosella musawasensis, is only 0.325 mm long.

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image: Image of the Day: Colon Cross-Section

Image of the Day: Colon Cross-Section

By | October 27, 2015

This slice of human colon tissue shows goblet cells (red) surrounded by enterocytes and connective tissue.

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image: Image of the Day: Cell Skeleton

Image of the Day: Cell Skeleton

By | October 26, 2015

Actin bundles (gold) in these human myoblasts provide mechanical support for the cells’ movement and function.

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image: Image of the Day: Toxic Taste

Image of the Day: Toxic Taste

By | October 23, 2015

The skipper butterfly caterpillar (Pyrrhopyge thericles) is toxic to predators because it feeds on poisonous Vismia plants.

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image: Image of the Day: Dazzling Decay

Image of the Day: Dazzling Decay

By | October 22, 2015

This time-lapse micrograph shows marine bacteria (blue) feeding on a decaying ocean diatom (silver, 0.1 mm long).

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image: Image of the Day: Honeycomb Home

Image of the Day: Honeycomb Home

By | October 21, 2015

Honeybee larvae (left) hatch from eggs (right) in their cells approximately three days after being laid.

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