This South American hummingbird uses its long beak to sip nectar stored deep inside flowers.
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Chloroplasts are visible within cells of the forest-growing moss Plagiomnium affine.
Chromosomes in a fibroblast's nucleus during the resting stage of the cell cycle are individually labeled with fluorescent tags.
This scanning electron micrograph of a leaf's epidermis features stoma shaped like small mouths for gas exchange and hair-like structures called trichomes.
This butterfly of the species Catopsilia pyranthe, found in parts of Southeast Asia and Australia, blends in with foliage.
The rose chafer Cetonia aurata protects its delicate hindwings beneath hard casings, called elytra, until it is time to take off.
Most freshwater crustaceans of the species Daphnia magna, like this one, are female and reproduce through parthenogenesis.
This juvenile fish has developing bone stained red and developing cartilage stained blue.
White blood cells engulf spores of the fungus Aspergillus fumigatus, which often causes disease in immunocompromised people.
The star-nosed mole's unusual appendages radiating around its nostrils have the highest nerve ending densities of any mammalian skin surface.
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