The rapid effects of human land development and urbanization present relatively recent but stark changes in the environment, which can have consequences for wild animals. For example, recent work suggests that urbanization affects the composition of animal gut bacteria. One evolutionarily unprecedented consequence of urbanization is noise, and noise pollution is most likely a biologically relevant stressor in urban environments. Noise pollution can interfere with many aspects of an animal’s life by changing social behaviours, interfering with foraging and predator identification, and changing stress hormone levels. Sustained increases in stress hormones can have wide ranging physiological repercussions and may change the substrate for intestinal bacteria through alterations in gut physiology such as increased intestinal mobility, permeability, and inflammation, leading to changes in the composition and relative abundances of gut microbiota. We experimentally examine this relationship between noise and the gut microbiome through measurements of stress hormones and feeding behaviour.