Population status

Northern Mockingbird
(Mimus polyglottos)

The best available long-term monitoring data for the Northern Mockingbird come from the Breeding Bird Survey (BBS). BBS results suggest that Canadian populations have increased by more than 100% since about 1970. However, this result has weak precision, and the BBS does not provide good coverage of well-populated areas where this species is most often occurs. The Atlas of the Breeding Birds of Ontario provides additional information for the Ontario portion of the range, and shows a large increase in occurrence between the two Atlas periods. Although occurrence does not equate directly to abundance, a change of this magnitude likely indicates an increase in the population. However, this result has poor precision. Combined, these two surveys indicate a large increase in the Canadian population of Northern Mockingbirds since about 1970. BBS results for North America indicate little overall change in the continental population.

Breeding Bird Survey (BBS) - Canadian analysis

Additional information on: Breeding Bird Survey (BBS) - Canadian analysis

View definitions of table column headings being used by: Breeding Bird Survey (BBS) - Canadian analysis

Table 1: Population trends by geographic area
Geographic area	Time Period ^{Table 1 - footnote 1}	Annual trend ^{Table 1 - footnote 2}	Intervals ^{Table 1 - footnote3}
Geographic area	Time Period ^{Table 1 - footnote 1}	Annual trend ^{Table 1 - footnote 2}	Lower	Upper
Canada Select to view graph of the geographic area: Canada 1970-2012; Breeding Bird Survey (BBS) - Canadian analysis	1970-2012	1.9	-0.9	4.9

Atlas of the Breeding Birds of Ontario

Additional information on: Atlas of the Breeding Birds of Ontario

View definitions of table column headings being used by: Atlas of the Breeding Birds of Ontario

Table 2: Population trends by geographic area
Geographic area	Time Period	Annual trend (%) ^{Table 2 - footnote 1}	Limits
Geographic area	Time Period	Annual trend (%) ^{Table 2 - footnote 1}	Lower	Upper
Ontario	1981/85 - 2001/05	5.5	0.7	10.4

Breeding Bird Survey in North America (BBS) - U.S. analyses

Additional information on: Breeding Bird Survey in North America (BBS) - U.S. analyses

View definitions of table column headings being used by: Breeding Bird Survey in North America (BBS) - U.S. analyses

Table 3: Population trends by geographic area
Geographic area	Time Period	Annual trend ^{Table 3 - footnote 1}	Limits
Geographic area	Time Period	Annual trend ^{Table 3 - footnote 1}	Lower	Upper
North America Select to view graph of the geographic area: North America 1966-2012; Breeding Bird Survey in North America (BBS) - U.S. analyses	1966-2012	-0.6	-0.8	-0.5

References

Farnsworth, G., G.A. Londono, J.U. Martin, K.C. Derrickson, and R. Breitwisch. 2011. Northern Mockingbird (Mimus polyglottos), The Birds of North America Online (A. Poole, Ed.). Cornell Lab of Ornithology, Ithaca, New York. Farnsworth, G., G.A. Londono, J.U. Martin, K.C. Derrickson, and R. Breitwisch. 2011. Northern Mockingbird (Mimus polyglottos), The Birds of North America Online (A. Poole, Ed.). Cornell Lab of Ornithology, Ithaca, New York. (Link)