Tracking Data for Red-faced Cormorants (Phalacrocorax urile)

Science Center Objects

Available here are tracking data for the red-faced cormorant, a seabird species that is found only in the North Pacific Ocean, breeding and wintering from southern Alaska and throughout the Aleutian Islands to Far Eastern Russia. These data were collected to better understand the migratory patterns of red-faced cormorants that breed in the Aleutian Islands.

Return to Ecosystems >> Wildlife Tracking Data Collection

USGS Alaska Science Center scientists collect data from wildlife tracking devices to: determine locations of animals throughout their annual cycles, understand patterns of habitat use, quantify time spent on various behaviors, and identify geographic areas repeatedly used by wildlife that may indicate sites of importance to species and populations. Tracking data from other wildlife species can be found at:

Tracking Maps

Argos Wildlife Tracking Red-faced Cormorants - animation

Argos Wildlife Tracking of Red-faced Cormorants.(Credit: David Douglas, USGS. Public domain.)

Red-faced Cormorant Tracking Maps

These webpages contain four different types of browse maps and other visualizations of the tracking data.

  • Maps (Animated, Static, Interactive, and Google Earth)
  • Summary graphs of the data: where, when, duration
  • Note: Only two red-faced cormorants were marked in this study and neither moved very far from the original marking location. These maps serve only as a depiction of the geographic content of the specific data provided and may be inappropriate for inferences and interpretation outside the intent of the original study. For example, maps may portray only certain ages, sexes, limited numbers of animals or variable tracking duration and start times that may limit inference for other questions. Users are advised to read the publication(s) and data set metadata associated with these maps to understand appropriate use and data limitations.

Data Packages

Argos Satellite Telemetry Data

These data packages contain the data collected from satellite transmitters attached to free-ranging animals. The packages include both raw and processed location and sensor data. The raw data includes data as originally retrieved from the Argos System. The processed data have been filtered for location plausibility, and sensor data have been decoded into standard measurement units. For most users, the processed data will be preferred.

Suggested Citation

Hatch, S.A., Gill, V.A., Mulcahy, D.M., Douglas, D.C., 2020, Tracking data for Red-faced cormorants (Phalacrocorax urile) (ver 1.0, August 2020): U.S. Geological Survey data release,