The site was identified as important in 2008 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.Populations meeting IBA criteria ('trigger species'):
|Species||Current IUCN Red List Category||Season||Year(s)||Population estimate at site||IBA criteria met|
|Ring-billed Gull Larus delawarensis||LC||breeding||1986||55,000 breeding pairs||A4i|
|A4iii Species group - waterbirds||n/a||breeding||1984||50,000-99,999 breeding pairs||A4iii|
The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2008).
|Habitat (IUCN level 1)||Habitat detail||Extent (% of site)|
|Wetlands (inland)||Riverine sand beaches, Freshwater lakes & pools, Freshwater marshes & swamps, Cliffs, rocky shores & islets (freshwater)||-|
|Artificial/Terrestrial||Urban parks & gardens||-|
|Land-use||Extent (% of site)|
|nature conservation and research||-|
BirdLife International (2023) Important Bird Area factsheet: Leslie Street Spit. Downloaded from http://datazone.birdlife.org/site/factsheet/leslie-street-spit-iba-canada on 02/12/2023.