Q. Can I talk to a real person?
A. Yes. Our membership team is small, but we're here to help. Our office hours are typically Monday through Friday, 9 a.m. to 6 p.m. (Arizona time), and you can call anytime. If you reach our voicemail, don't worry — we'll return your call promptly.

Reach us by phone at (520) 623-5252 or toll-free at (866) 357-3349.

Fax us at (520) 623-9797.

Email our membership team at

Write to us at:
Center for Biological Diversity
Membership Department
P.O. Box 710
Tucson, AZ 85702-0710

Our tax ID number is ID 27-3943866.

If you experience difficulty making a donation online or purchasing an item from our Web store, please contact us right away.

Center Videos

Thanks to You, Wildlife Wins

Watch more Center videos.


Best in America seal
Charity Watch

Best in America

“I have supported the Center for quite awhile now — the reason is because these guys are effective — I can see my money working in lawsuits against the feds, etc. The Center considers all creatures great and small to be important — everybody cares about polar bears, but who cares about frogs? The Center cares, and wants to make sure everyone is aware of how humans are driving them to extinction. Kudos to Kierán for the quarterly briefings, and the way the staff makes donors feel cherished and special.” – Joan DaVanzo, Leadership Circle member

"The Center for Biological Diversity makes a long-term impact with its incredible sucess in winning court cases. Thanks to them, our fellow creatures have a voice.”
Arlene, via

"They are pound for pound, dollar for dollar, the most effective conservation organization in the country"
LA Weekly

"People should help animals because its the right thing, not because you're being rewarded."
—Kaylyn, age 10

“I think it's important to help Center for Biological Diversity because they know how to use the money wisely, they know how to save the animals with money, and they know what they are doing.”
Austin Lee, fourth grade, Los Angeles

Read more reviews of the Center.

Photo by Bryant Austin, California Fish and Game.