Mural by Daniel Martelock at 39 Lyndale Avenue (2012)

This street art mural by Daniel Martelock is located in the Mechanicsville neighborhood of Ottawa, Ontario, and is part of his "Bird Army" series. The artwork is painted on a brick wall background and depicts two house sparrows perched on a branch facing each other. Both birds wear green helmets and matching green straps across their chests.

The imagery serves as a symbol for community, teamwork, and mutual protection. House sparrows do not migrate for the winter. Instead, they band together in flocks to keep each other safe, splitting up in the spring to nest while remaining close enough to collectively fight off predators and protect their young.

In this specific piece, the artist incorporates mathematical symbols to represent collaboration. The house sparrow on the left features a red plus sign inside a white circle on its helmet and bag, while the sparrow on the right features a red minus sign on its helmet. The pairing illustrates how opposites like minus and plus work together to build a functional community.