Karner blue butterflies, first described by Vladimir Nabokov, depend on wild lupine to survive in their larval form.
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A simulation of the conformation of human chromosome 19, based on knowledge of co-regulated gene pairs.
Cells covered in tiny, hair-like cilia clear foreign substances from the respiratory tract.
During mating, a male damselfly holds a female behind her head while she loops her abdomen forward to pick up sperm that he has deposited in a secondary sexual organ.
A sea star just after metamorphosis from its larval form.
The chalcid wasp species Kikki huna is smaller than a grain of salt and has thin wings with long bristles at their ends.
An HIV-infected dendritic cell shoots out thin projections called filopodia (red) with virus particles (white) at their ends.
After someone tried to move this Namib desert-dwelling chameleon off a roadway, it opened its mouth wide in a threat display.
This South American hummingbird uses its long beak to sip nectar stored deep inside flowers.
Chloroplasts are visible within cells of the forest-growing moss Plagiomnium affine.
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