Male black swallowtails have different dorsal patterns--much more yellow, very little blue, an eyespot. So, males have the protection of mimicry when they are resting with wings folded together over ...

New research finds their distinct yellow ... pattern rarely evolves in species that have little opportunity to lure prey, perhaps because they are concealed in a retreat or build their webs in ...

I like to wear khaki pants and blue (light or jean dark) shirts. What color tie patterns would work with this? I always rely on a yellow and blue pattern, but I'd like some other options.

encoding a little-known polyketide synthase enzyme in the blue birds. In another key experiment, the researchers compared gene expression from feathers of green and yellow versus blue budgies.

When brown is made lighter, it becomes yellow. In contrast, people’s perception of red, blue and green stays the same despite how bright or dark they are. “It could be that its been important ...