Cliff Swallow nest
Cliff Swallows build distinctive gourd-shaped nests from hundreds of mud pellets, usually under cliffs, bridges, or building eaves. These colonial birds often construct large nesting clusters, with dozens or even hundreds of nests packed side by side. Each nest has a small entrance tunnel leading to a lined interior where 3–6 eggs are laid. The mud structure provides insulation and protection from predators. Cliff Swallows are skilled aerial insect hunters, often seen swooping and darting near their nesting sites to feed.
