Cells vary in shape and function, and while some are enormous (the ostrich egg, the largest single cell in the animal kingdom, averages six inches long and weighs about three pounds), most cells can only be seen with the help of a microscope. The smallest object the human naked eye can see is approximately one-tenth of a millimeter (0.10 mm) in size—roughly the thickness of a piece of paper (0.15 mm), and the approximate diameter diameter of a Southern white rhino egg (0.14 mm). Let's zoom in and see how other cells measure up.

Ian Ingram, M.S., M.F.A., a conservation technology scientist for San Diego Zoo Wildlife Alliance (SDZWA) and leader of the Conservation Technology Lab, explores deep learning and its role in protecting wildlife.

Honoring the Past, Safeguarding Our Future

Some species that spend time in the water just might surprise you.

Mom means a lot of different things in the world of wildlife.

Technology is making a powerful difference in the world of conservation, and our teams are at the forefront.

In the face of increasing biodiversity loss, biobanks like ours play an essential role in conservation.

SAN DIEGO (Jan. 2, 2023) – Today, San Diego Zoo Wildlife Alliance participated in the 134th Rose Parade presented by Honda, with a float celebrating the San Diego Zoo Safari Park’s 50th anniversary. The float’s theme, “Celebrating 50 Years of Conservation,” depicted rhinos, giraffes and the Safari Park’s iconic Wildlife Safari experience, bringing to life the Safari Park’s ability to connect guests with wildlife and provide life-changing moments.

SAN DIEGO (Nov. 3, 2022) – On Jan. 2, 2023, San Diego Zoo Wildlife Alliance—an international conservation organization with “two front doors”: the San Diego Zoo and the San Diego Zoo Safari Park—will participate in the  134th Rose Parade presented by Honda, with a float celebrating the Safari Park’s 50th anniversary. The Safari Park opened in 1972 and since the beginning, saving species has been a key part of the Safari Park’s mission.