When it’s really cold outside, you may find that food disappears from any bird feeders you maintain at a faster-than-normal rate. Birds (and other animals) burn more calories when it is cold. That means they need more food to maintain their body weight.
Bird feeders are one source of food, but so are weed seeds, winter berries, nuts and any insects that can be pried out of their hiding spots for winter.
Think diversity when providing food for birds and read more at: http://content.yardmap.org/learn/habitat-defined/food/
reprinted from YardMap