This document describes a citizen science project called "Be a Scientist for a Day" conducted by the Bombay Natural History Society (BNHS) to survey biodiversity at their nature reserve. It provides an overview of citizen science, describes the study area and methodology of the project. Results are presented on the data collected by citizen scientists on plants, insects, moths, reptiles, amphibians and birds. Feedback indicates the project was well-received and successful in engaging amateurs in field research. Future plans include making it a regular program and publishing scientific papers on results.