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Elizabeth Yu: Cliff Swallow (Petrochelidon pyrrhonota)
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Elizabeth Yu: Cliff Swallow
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Elizabeth Yu: Cliff Swallow in Nest
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Elizabeth Yu: Cliff Swallow
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Elizabeth Yu: Cliff Swallow in Nest
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Elizabeth Yu: Baby Swallows
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Elizabeth Yu: Hungry Baby Swallows
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Elizabeth Yu: Baby Swallows
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Elizabeth Yu: Cliff Swallow
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Elizabeth Yu: Hungry Babies
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Elizabeth Yu: Cliff Swallow
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Elizabeth Yu: Cliff Swallow Feeding Babies