Penises of some species of ducks grow extremely long in spring, only to shrink to 10 percent of their maximum size in the fall and winter, report researchers.
Researchers have created self-assembling “patchy particles” that are 1/200th the width of a human hair and can form endless structures from a handful of basic pieces.
When parts of a plant, such as dead leaves, flowers, or ripe fruit detach, the process is called abscission. A new study sheds light on the process that governs how and when plants shed their parts.
A pair of master genes control the complex traits in butterfly wings—one for colors and iridescence and the other for stripe patterns, two new papers suggest.