It’s been hot for a week, made worse by thick humid conditions. Smart money says stay in the house. But playing it smart means no hope to see good things in nature. Indoors offers nothing. Outdoors, ...

Great egrets and little blue herons. Blue-winged warblers and yellow-bellied sapsuckers. Snowy owls and tropical kingbirds. Across North America, three-fourths of bird species are in decline, ...

The decisions combined the common redpoll and hairy redpoll, split up the barn owl into three species, and changed grammar. Defining a species is, like any other scientific endeavor, subject to ...