Ecologists study living organisms and their interaction with each other and their environment. This might include the study the behaviour of such organisms and the properties of their environment, such as climate and geography.
Ecologists might be required to do field work (venturing into the environments they study to procure samples or collect data on behaviour) and work in a laboratory analyzing data or samples.
They might work in the field or in a laboratory or in both places.
Here are some schools that have programs related to this career: