i'm not sure why , but in the spring when the come out from hibernating they are exceptionally bright ....... we'll see what February brings , but our winter has been freakishly warm .... it was 64 today , 63 yesterday , the 3rd thru 4rth week of january is historically the coldest part of our winter , the normal average temperature is 28 degrees , were like 30-40degrees too warm ........