Sierra Nevada Red Fox

The Sierra Nevada Red Fox dataset is consumed from an external Open Geospatial Consortium Web Mapping Service (OGC WMS) via the following URL endpoint and layer name:
  URL:
  https://www.sciencebase.gov/geoserver/CONUS_HabMap_2001/wms
Layer name: Sierra Nevada Red Fox (Vulpes vulpes necator) mREFOn v1

OpenLayers

If you are developing in OpenLayers 2, you will want to use the OpenLayers WMS class.

An example of your solution might look similar to the code below.

layer = new OpenLayers.Layer.WMS(
    "Sierra Nevada Red Fox"",
    "https://www.sciencebase.gov/geoserver/CONUS_HabMap_2001/wms",
    {
      layers: Sierra Nevada Red Fox (Vulpes vulpes necator) mREFOn v1,
      transparent: "true",
      format: "image/png"
    },
    {}
);

map.addLayer(layer);