A Canadian study found that bird and tree species diversity were significantly positively related to good self-reported mental health. In the 36 Canadian cities studied, living in a postal code with bird diversity and tree species richness one standard deviation higher than the average increased good mental health by 6.64% and 5.36% respectively, after controlling for independent variables.
Buxton, Rachel T., Emma J. Hudgins, Eric Lavigne, Paul J. Villeneuve, Stephanie A. Prince, Amber L. Pearson, Tanya Halsall, Courtney Robichaud, and Joseph R. Bennett. “Mental health is positively associated with biodiversity in Canadian cities.” Communications Earth & Environment 5 (2024): 310. https://doi.org/10.1038/s43247-024-01482-9
