A female Anna’s hummingbird sits in a dormant tree in winter. Hummingbirds have the ability to go into torpor – a very deep sleep state – to conserve energy on really cold days and nights.
A female Anna’s hummingbird sits in a dormant tree in winter. Hummingbirds have the ability to go into torpor – a very deep sleep state – to conserve energy on really cold days and nights. File photo
A female Anna’s hummingbird sits in a dormant tree in winter. Hummingbirds have the ability to go into torpor – a very deep sleep state – to conserve energy on really cold days and nights. File photo

Upside-down hummingbirds don’t need help

February 02, 2018 02:00 PM

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