A catechism is 1. a manual for instructing systematically; spe cif: a summary of religious doctrine often in the form of questions and answers. 2. a set of formal questions put as a test. What is a ...

Here & Now 's Robin Young visits the Cornell Lab of Ornithology ahead of Global Big Day on Saturday — a big day for birders.

Learn about the study of birds known as ornithology. Explore the history of avian science, its importance in ecology, and the work of famous ornithologists. The scientific study of birds is called ...

Nineteenth-century ornithologists, like journalists, specialized in the — who, what, where, when — of observing birds. Many birds of this era were collected in the field, stuffed and studied, leading ...