They're the tiny, fuzzy yellow or brown balls on oak leaves and branches. You could spot one or two, then dozens around the same tree. Oak galls are the result of gall wasps. Inside the galls are ...

One of the country’s more whimsical-looking trees ... leaves of southern live oaks; farther north, they depend on other oak species. Once they become butterflies, though, they are hard to spot ...

Learning to spot just a few of our most common trees, like the english oak, silver birch, or white willow, is great start. Here are the leaves of an english oak, for example… Image caption ...

Poison oak has leaves that grow in groups of three, have wavy edges, and fuzzy undersides. A poison oak rash is usually pink or red and will usually appear within 24 hours. You can treat poison ...