A male Tree Swallow shows off his dazzling iridescence at UC Davis Putah Creek picnic grounds, May 2019. (c) Zane Pickus, UC Davis

A male Tree Swallow shows off his dazzling iridescence at UC Davis Putah Creek picnic grounds

A male Tree Swallow shows off his dazzling iridescence at UC Davis Putah Creek picnic grounds, May 2019. (c) Zane Pickus, UC Davis

A male Tree Swallow shows off his dazzling iridescence at UC Davis Putah Creek picnic grounds

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