Love is in the air. This Valentine’s Day, take inspiration from some of the great bird species that mate for life. Here are just a few examples of the many winged wonders that fall into this category. Black Vulture Average clutch size: 2 eggs Cool fact: This vulture species doesn’t build a nest, but rather lays its eggs on the ground or in hollow cavities. Yes, even Black Vultures stick together. “One bird, presumed to be male, chases a presumed female through the air and periodically dives at her” as part of the mating ritual, according to Birds of North America online. They form such a tight bond, in fact, that they hang out year round—not just during breeding season. Bald Eagle 5346 Average clutch size: 1-3 eggs Cool fact: Measuring six feet across and four feet tall (or even larger!), Bald Eagle nests are some of the largest of any avian species. These birds, the symbol of the United States, mate for life unless one of the two dies. Their...