IBA Criteria Category 1

Sites regularly holding significant numbers of an endangered, threatened, vulnerable, or declining species.

Sites that regularly support significant numbers of one or more of the following breeding or nonbreeding species listed as endangered, threatened, or of special concern in the state of Massachusetts. These include breeding, wintering, or migratory areas. The site should be one of regular and/or recent occurrence (in the past ten years). Thresholds will vary and may include sites with 1% of the state population (if known) in a season, or represent one of the three to five sites in the state with the highest regularly occurring numbers. The site holds a significant number of individuals classified as:

Federally Endangered or Threatened

(1% or more of state population)
Endangered - Roseate Tern
Threatened - Bald Eagle & Piping Plover
Delisted - Peregrine Falcon

State-Endangered, Threatened, or of Special Concern

(1% or more of state population)



Special Concern

Pied-billed Grebe Northern Harrier Common Loon
Leach’s Storm-Petrel King Rail Sharp-shinned Hawk
American Bittern Northern Parula Common Moorhen
Least Bittern Vesper Sparrow Common Tern
Upland Sandpiper Grasshopper Sparrow Arctic Tern
Short-eared Owl Least Tern  
Loggerhead Shrike Barn Owl  
Sedge Wren Long-eared Owl  
Golden-winged Warbler Blackpoll Warbler  
Henslow’s Sparrow Mourning Warbler  

For more information on state and national population trends or these species, go to the Breeding Bird Survey Data.