The average White-winged Crossbill can eat up to 3,000 seeds per day. How can one bird get access to so much food? The answer lies in the structure of this bird’s unique crossed bill. This physical adaptation grants the White-winged Crossbill access to seeds from pine cones that other species with ordinary bills simply can’t get to. The crossed bill acts as a barrier to species competing for food within the same habitat. What appears at first to be an abnormality is in fact extremely advantageous.