Foster (born August 1, 1942) is an American zoologist who researched the evolution of lek behavior in birds, bird-plant interactions, and male-male cooperation in reproduction.
She is very active in conservation efforts, including training workshops, being a Scientific Advisor for the National Bio-inventory Program of Paraguay, as a Founding Director of the American Bird Conservancy, and as a Founder and Co-coordinator of the Latin American Library Enhancement Program.
She is also the Director and Editor of a program to publish handbooks giving "standard methods for measuring and monitoring the biodiversity of different groups of organisms".