I am helping study the home range of degus- where they go, who they hang out with, who they sleep with (haha) day and night. We do this by putting little radio collars on the animals and following them with telemetry- during the day we locate them once an hour, 6-8 hours a day, for 6-12 days.
The first step is to catch a bunch of animals and collar them. We use wire traps and bait them with oats. When the animals walk in they step on a treadle that shuts the door behind them, and then we walk around and check the traps every few hours. We take them out of the traps, determine the sex, reproductive status, weight, and snip a bit of the ear off to both mark that we have caught them before and for genetic analysis (at Rinconada, the field site near Santiago, the animals have ear tags with ID numbers on them).
To figure out where they sleep at night, we use a single hand antenna attached to a receiver and walk around in the dark, pointing it at bushes until we find the strongest beep. It really is as bizarre as it sounds!! Some animals sleep in the same burrow system every night and are really easy to find, but other ones move around a whole lot and we have to tromp around the field site for a while to find them.

