We aim to understand how animals migrate and how they survive. To do this, we equip individuals with state-of-the-art biologgers. Data from these transmitters are collected in an international online database that is accessible to the public. Between 2014 and 2020, the ICARUS-Initiative plans to establish a novel system capable of tracking even very small animals. This research will provide new insights into how organisms cope with the effects of climate change, disease, and man-made alterations to their environment.