Cliff Swallows build characteristic "mud houses" to nest in. As featured in this image, they gather mud pellets and carry them back to their nesting area. Pellet by pellet, they assemble their houses in order to protect themselves and their young. A single house is usually composed of over 1000 pellets.
Cliff Swallows build characteristic "mud houses" to nest in. As featured in this image, they gather mud pellets and carry them back to their nesting area. Pellet by pellet, they assemble their houses in order to protect themselves and their young. A single house is usually composed of over 1000 pellets.
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