Each year on March 3, World Wildlife Day draws global attention to the plants and animals that make life on Earth possible.

MUNCIE, Ind. – Keystone species are plants, animals, or fungi that significantly impact the environment. When talking about plants, these species can be home to many native insects and other animals.

More than 50 years after Bob Paine’s experiment with starfish, hundreds of species have been pronounced “keystones” in their ecosystems. Has the powerful metaphor lost its mathematical meaning? Anne ...