UNDATED (KDAL) - Another sure sign of spring, the loons are making their way back to Minnesota lakes after a winter in the Gulf of Mexico. About six of the 29 loons that are being monitored by radio and satellite devices have already returned to their home lakes about three weeks sooner than normal. The birds outfitted with the transmitting gear allows researchers to track exactly where the loons go on their migrations to the gulf and back. An additional 30 loons will be fitted with the special tracking systems this summer. Funding for the program comes from the Minnesota Natural Resources Trust Fund.