The Anna's Hummingbird is best monitored in Canada by the Christmas Bird Count (CBC). The species was first reported in British Columbia in the late 1940s and the first breeding event was discovered in 1958 (Campbell et al. 1990). Numbers remained very low until the 1970s, when the species became more widespread on the south coast (Campbell et al. 1990). CBC results from within Canada suggest a large increase in population since the early 1970s. Breeding Bird Survey (BBS) data from Canada are too sparse to calculate a national trend, but range-wide data from both the BBS and CBC indicate large increases in the continental population. Targeted efforts to record birds at feeders during the CBC have increased over time but, despite this bias, the magnitude of the increase and the concordance of results from both the CBC and BBS are sufficient to reliably conclude that the Canadian population of Anna's Hummingbird has experienced a large increase in Canada. The species is at an acceptable level relative to its national population goal (see CBC Canada graph below).
Additional information on: Christmas Bird Count (CBC)
Additional information on: Breeding Bird Survey (BBS) - Canadian analysis