Population status

Common Raven
(Corvus corax)

The Breeding Bird Survey (BBS) provides good coverage of the breeding population of the Common Raven. BBS results suggest that this species has shown a dramatic and continuing increase since 1970. At the regional level, all Bird Conservation Regions (BCRs) for which there are reasonably reliable BBS results (displayed below) show increasing trends for Common Ravens, with particularly dramatic increases in the Prairie Potholes and the Lower Great Lakes/St. Lawrence Plain BCRs. The Christmas Bird Count results for this resident species in Canada corroborate the large increase in numbers. Continental results from these two surveys indicate the increase is continent-wide. Considering the agreement between these two sources, the reliability of this assessment is considered high. The Common Raven is at an acceptable level relative to its national population goal (see BBS Canada graph below).

 

Population goal and acceptable levels of variation

Species/groupGoalLower levelUpper level
Common RavenMean abundance (2008-2012)10th percentile of observed abundance (1970-2012)Not applicable

Breeding Bird Survey (BBS) - Canadian analysis

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

Table 1: Population trends by geographic area
Geographic areaTime Period Table 1 - footnote 1 Annual trend Table 1 - footnote 2 Limits
LowerUpper
Canada Select to view graph of the geographic area: Canada 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20162.523
Canada Select to view graph of the geographic area: Canada 2006-2016; Breeding Bird Survey (BBS) - Canadian analysis2006-20162.61.33.9
Northern Pacific Rainforest Select to view graph of the geographic area: Northern Pacific Rainforest 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20161.20.22.3
Great Basin Select to view graph of the geographic area: Great Basin 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20161.50.52.4
Northern Rockies Select to view graph of the geographic area: Northern Rockies 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20161.20.32.2
Prairie Potholes Select to view graph of the geographic area: Prairie Potholes 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-201614.412.815.9
Boreal Hardwood Transition Select to view graph of the geographic area: Boreal Hardwood Transition 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20162.623.1
Lower Great Lakes / St. Lawrence Plain Select to view graph of the geographic area: Lower Great Lakes / St. Lawrence Plain 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-201610.69.112.1
Atlantic Northern Forest Select to view graph of the geographic area: Atlantic Northern Forest 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20160.2-0.20.7
North America Select to view graph of the geographic area: North America 1970-2016; Breeding Bird Survey (BBS) - Canadian analysis1970-20162.92.63.2
 

Picture of logo Christmas Bird Count (CBC)

Additional information on: Christmas Bird Count (CBC)

Table 2: Population trends by geographic area
Geographic areaTime PeriodAnnual Trend Table 2 - footnote 1 Limits
LowerUpper
Canada Select to view graph of the geographic area: Canada 1970-2016; Christmas Bird Count (CBC)1970-20162.51.53.89
North America Select to view graph of the geographic area: North America 1970-2016; Christmas Bird Count (CBC)1970-2016324.43
 

References