Allbirds just put a bird on it—or a pigeon, to be more precise. The cult-fave footwear brand roped in graphic artist and streetwear designer Jeff Staple to create a limited-edition Tree Dasher with the “Staple pigeon” perched near the heel. Staple, Allbirds said, turned the lace-free sneaker “inside out” to show off its natural materials:…