Plants and Animals

Gavia immer Common loon

species photo
species photo
species photo
species photo
species photo
species photo

Key Characteristics

The Common loon is a large, heavy-bodied bird, averaging 32 inches (81.3 cm) in length, with a wingspan of about 5 feet (1.5 m). In breeding plumage, its head and dagger-like bill are dark, its breast white, and its back is a distinctive black and white checkerboard pattern.

Status and Rank

US Status: No Status/Not Listed
State Status: T - Threatened (legally protected)
Global Rank: G5 - Secure
State Rank: S3 - Vulnerable

Occurrences

CountyNumber of OccurrencesYear Last Observed
Alcona 11 2021
Alger 35 2021
Allegan 1 1988
Alpena 5 2021
Antrim 7 2021
Baraga 21 2019
Barry 7 2019
Benzie 7 2021
Charlevoix 8 2021
Cheboygan 16 2021
Chippewa 21 2019
Clare 23 2021
Crawford 8 2021
Delta 5 2019
Dickinson 19 2020
Emmet 8 2021
Gladwin 8 2021
Gogebic 113 2021
Grand Traverse 25 2021
Houghton 9 2018
Iosco 9 2021
Iron 68 2021
Isabella 2 2021
Kalkaska 19 2021
Keweenaw 50 2011
Lake 17 2021
Leelanau 8 2021
Luce 10 2017
Mackinac 21 2006
Manistee 4 2015
Marquette 34 2021
Mason 3 2021
Mecosta 34 2021
Missaukee 7 2021
Montcalm 6 2018
Montmorency 25 2021
Newaygo 13 2021
Oakland 1 1952
Oceana 3 2012
Ogemaw 28 2021
Ontonagon 10 2021
Osceola 10 2021
Oscoda 8 2021
Otsego 17 2021
Presque Isle 17 2021
Roscommon 9 2020
Schoolcraft 48 2019
Wexford 5 2021

Information is summarized from MNFI's database of rare species and community occurrences. Data may not reflect true distribution since much of the state has not been thoroughly surveyed.

Habitat

Typically, Common loons nest in sheltered islands on large, undeveloped inland lakes, although they may nest in lakes as small as 11 acres (4.5 hectares). Preferred nest sites are on small islands or bog mats, at the water’s edge. Nursery areas - quiet, shallow, sheltered coves - are important for rearing chicks.

Natural Community Types

  • Bog
  • Emergent marsh
  • Great lake, littoral, benthic
  • Great lake, littoral, midwater
  • Great lake, pelagic, benthic
  • Inland lake, pelagic, midwater

For each species, lists of natural communities were derived from review of the nearly 6,500 element occurrences in the MNFI database, in addition to herbarium label data for some taxa. In most cases, at least one specimen record exists for each listed natural community. For certain taxa, especially poorly collected or extirpated species of prairie and savanna habitats, natural community lists were derived from inferences from collection sites and habitat preferences in immediately adjacent states (particularly Indiana and Illinois). Natural communities are not listed for those species documented only from altered or ruderal habitats in Michigan, especially for taxa that occur in a variety of habitats outside of the state.

Natural communities are not listed in order of frequency of occurrence, but are rather derived from the full set of natural communities, organized by Ecological Group. In many cases, the general habitat descriptions should provide greater clarity and direction to the surveyor. In future versions of the Rare Species Explorer, we hope to incorporate natural community fidelity ranks for each taxon.

Management Recommendations

Loons are sensitive to human disturbance during the breeding season. Minimize maintenance activities within 1/4 mile of active nests during the breeding season. Nursery areas may be vulnerable also. Schedule construction, maintenance, or habitat management activities during the non-breeding season, from September through February. Application of herbicide to control aquatic vegetation should only be conducted outside the nesting season on lakes where loons nest, particularly on small lakes.

Active Period

Migration from second week of March to third week of May

Migration from third week of October to third week of December

Nesting from first week of May to fourth week of July

Survey Methods

Loons are easily surveyed by visually checking suitable habitat from shore or a boat throughout the day. Their presence may also be detected by their distinctive calls, which may be heard day or night.

Visual survey, listen for call

Survey Period: From first week of May to fourth week of July

Time of Day: Daytime

Time of Day: Night

References

Survey References

  • Bibby, C.J., N.D. Burgess, and D.A. Hill. 1992. Bird Census Techniques. Academic Press, New York.

Technical References

  • Evers, D.C. 1994. Endangered and Threatened Wildlife of Michigan. The University of Michigan Press, Ann Arbor. 412pp.
  • Sibley, D.A. 2000. The Sibley Guide to Birds. Knopf, Toronto. 544pp.