One common occurrence in fall is that one day no birds will be at your feeder but then the next day, the birds are feeding like there’s no tomorrow. There won’t be a tomorrow if they don’t quickly build up body stores of fat. Birds start “feeding frenzies” when their internal clock is triggered by cooler weather and shorter days. The frenzy is called hyperphagia.
To help birds the most in fall and winter, feed them foods which have the highest energy per bite. Feeding suet really gives birds an energy boost per bite. Other high energy foods include sunflower hearts (42 fat calories per 100 grams), peanuts and tree nut pieces (412 fat calories per 100 grams), black oil sunflower (354 calories) and nyjer thistle seed (342 calories).