One sure sign of spring here in north-eastern Vermont is the frequent reminders from state and local officials to bring in your bird feeders. This is probably a common thing in any northern state at this time of year. The reason is that with the snow melting and temperatures rising, the bears are beginning to stir and will soon be out looking for food after their long winter nap. One of their favorite foods, especially this early when there isn’t a lot to eat, is black oil sunflower seeds,