Canadian environmental sustainability indicators : population status of Canada’s migratory birds.: En4-144/61-2025E-PDF

"Birds perform important ecological functions such as controlling insect and rodent populations and dispersing seeds. They also provide opportunities for bird watching and hunting. This indicator reports the proportion of bird species listed in the Migratory Birds Convention Act whose populations fall within their acceptable goal range and provides a snapshot of the general state of birds in Canada. When species fall below their population goal range, that signals the need for more effective conservation action to help them recover, whereas species that are above their goal range can be destructive to their habitats and may require further management"--Population status of Canada's migratory birds, page 5.

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