Wildlife and Aquatic Resources Branch

Research scientists on Yellowstone Lake

This branch is responsible for conserving and restoring native species and the ecosystem processes that sustain them. Biologists collect scientific data to assess the condition of resources, guide sound decision making, and prepare for future challenges such as emerging diseases, cross-boundary management of wide-ranging species, climate change, increasing visitation, and the intrusion of non-native species. Biologists focus research and monitoring on species that are of concern due to their status, their importance to ecosystem health, or their potential danger to visitors. They monitor threatened or endangered species in the park, such as the gray wolf, grizzly bear, and Canada lynx. They also conduct research on species of special concern due to threats to their population status. While some species are monitored continuously, others may be studied periodically in response to changing management challenges. Biologists monitor for infectious diseases in animal populations and proactively manage situations where humans interact with potentially dangerous wildlife. Several projects are underway to restore native fish and wildlife species to appropriate areas of the park.

Long-term studies and data collection have helped the park to understand key ecological processes influencing the conservation of fisheries and wildlife, including competition, diseases, disturbance dynamics, gene flow, migration and dispersal, natural selection, predation, and vegetation phenology. Studies that involve controversial and complex management issues require close collaboration and consultation with other federal and state agencies, local governments, non-governmental organizations, and Native American Tribes to achieve research and management goals.

The Wildlife and Aquatic Resources Branch includes the following programs:

  • Wildlife Health Program
  • Bird Program
  • Bear Management Program
  • Wolf and Ungulate Program
  • Bison Ecology and Management Program
  • Fisheries and Aquatic Sciences Program
two park rangers inspecting the wing of a small bird
Science Publications & Reports

View science publications and reports created by Yellowstone's Center for Resources on a variety of park topics.

A young bison calf with rust-red fur.

Learn about the park's abundant and diverse species—67 mammals, 285 birds, 16 fish, 5 amphibians, and 6 reptiles.

Last updated: December 21, 2023

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Contact Info

Mailing Address:

PO Box 168
Yellowstone National Park, WY 82190-0168



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