Millions of tagged images of Serengeti wildlife (40+ species of mammals and large birds) with metadata. Useful for wildlife, population, community, and behavioral ecology, as well as computer vision, machine learning, and education:

Swanson A.B., M. Kosmala, C.J. Lintott, R.J. Simpson, A. Smith, C. Packer (2015) Data from: Snapshot Serengeti, high-frequency annotated camera trap images of 40 mammalian species in an African savanna. Dryad Digital Repository.