The young leave the nest after 20 to 23 days. Diet Like all other hummingbird species, Costa's hummingbird feeds on flower nectar and any tiny insects that it happens to find in the flower petals. Torpor As with other hummingbird species, it can slow down its metabolism during cold nights when it enters a hibernation-like state known as torpor and its heart and respiration rate are dramatically slowed. Conservation The IUCN describes them as of least concern. The population is stable and there are no known threats. They are found in at least one protected area. References External links Costa's hummingbird Birds of Mexico Costa's hummingbird Endemic birds of Southwestern North America Fauna of the Baja California Peninsula Fauna of the Colorado Desert Fauna of the Lower Colorado River Valley Fauna of the Mojave Desert Fauna of the Sonoran Desert Native birds of the Southwestern United States Taxa named by Jules Bourcier