Photovoltaic solar energy is one of the cleanest electricity generation technologies, but are solar farms good or bad for birds? As birds are indicators of ecosystem health, it is important to look into how they are affected by solar energy facility infrastructure. While bird fatalities have been documented around large-scale facilities in the Southwestern U.S., proper development and management have been shown to benefit bird populations, so there are mixed opinions on the effects of PV solar facilities on birds. Addressing these questions requires lots of data on what bird types or species visit facilities and how they use them, but these data are difficult to collect by field surveys alone. By combining expert knowledge and a machine vision algorithm, we gathered a large number of such observations from video recordings collected at solar farms across the U.S. For example, during the breeding season of 2024, we identified at least 19 bird species, consisting of 12 songbirds, 3 raptors, 1 waterbird, 1 dove, and 1 hummingbird in the videos collected at a solar farm in the northeastern U.S. We recognized 4 types of nesting behaviors, as well as foraging behaviors both in the air and on the ground. In this presentation, we will review some examples of birds’ interactions with PV solar energy facility infrastructure and explore how we can collect data on hard-to-observe natural behaviors of wildlife in human-altered environments.