Three Scandinavian physiologists had great influences on the early development of ecophysiology, Per Scholander with temperature regulation and diving, Kjell Johansen with cardiovascular and respiratory physiology and Knut Schmidt-Nielsen with locomotion and the role of body size, among many other notable contributions. They emphasized the joy of expeditionary physiology to study unusual animals (and plants) in their natural environments, following the principle of August Krogh. All of them focused on novel, curiosity-driven questions about biology and were able to answer them with elegant approaches. These scientists were among the role models for my career. This presentation selects some of my studies related to their interests, as it deals with temperature regulation, cardiovascular physiology and scaling. It includes three cases illustrating the diversity of thermoregulatory strategies. The first is a Namib Desert golden mole, which abandons thermoregulation, runs on the surface to find food (unlike all other moles) and has a resting metabolic rate similar to a lizard. The second is also a shift from endothermy to ectothermy, but within two archosaur lineages leading to living crocodiles and birds. Originally endothermic, one lineage gave rise to endothermic dinosaurs and hence birds, but the crocodilian lineage presumably reverted to ectothermy when it invaded the aquatic, ambush predator niche. This loss of endothermy and the acquisition of diving behavior explain the unique four-chambered heart, the foramen of Panizza and other features of the crocodilian cardiovascular system. Finally, some flowers are not only powerfully endothermic, but also thermoregulatory, with a surprising precision. Recent work evaluates the precision and analyzes the role of floral size on heat production and gas exchange. Allometry shows that some flowers are designed to liberate heat and scent for attraction, while others retain heat that provides an energy reward to insect visitors.