Assertion: hummingbird's heart rate | /r/CapableOf | slow to 50-180 beats per minute
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Source sentences:
text: In contrast, when hummingbirds enter torpor, a hibernation-like state that allows them to sleep or withstand cold temperatures, their heart rates can slow to 50-180 beats per minute, about the rate of a newborn baby.
text: During this time this bird's body temperature drops down dramatically from its daytime temperature of about 105° (40.5°C) to 19 °C (66 °F) and the heart rate slows down from about 200 (average daytime resting heart rate per minute) to 50 - 180 beats per minute.