<p>Understanding the energetics of animals in their natural environments is critical for ecological research, conservation, and modeling of population dynamics. I present a comprehensive dataset of field metabolic rates (FMR) of animals, body mass and ambient temperature, encompassing data from a wide range of species and ecosystems. The dataset is a compilation of FMR measurements reported in the scientific literature on more than 700 species, and offers a valuable resource for researchers in ecology, conservation biology, and evolution. By including body mass and temperature, it allows: 1) use it in large-scale analyses of allometric models of body mass, and 2) incorporate explicitly the effects of temperature, making it a useful tool for comparative studies, ecological modeling, and conservation assessments, particularly regarding the effects of climate change.</p>