Soil bacteria are staggeringly diverse, but a few types are abundant nearly everywhere.
Nitrogen isotopes show how nutrients leach out of septic tanks and into pond ecosystems.
Flowering throughout the calendar could help tropical trees evade competitors.
The wood tiger moth employs an arsenal of different weapons to defend itself.
Fossilized duck-billed dino droppings from Grand Staircase-Escalante National Monument are full of rotten wood and crustaceans.