[DOC] [TLE] How do hummingbirds survive cold nights? | GrrlScientist | Science ... [PAR] Apr 9, 2006 ... Due to their high metabolism and small body size, hummingbirds rely upon ... 
Torpor is a type of deep sleep where an animal lowers its metabolic rate by as ... 
A hummingbird's night time body temperature is maintained at a ... "Although 
there is some evidence that torpor is an extension of slow-wave sleep,... [DOC] [TLE] Hummingbirds and Torpor - ScienceBlogs [PAR] Apr 9, 2006 ... Torpor is a type of deep sleep where an animal lowers its metabolic rate by ... A 
hummingbird's night time body temperature is maintained at a ... Although there 
is some evidence that torpor is an extension of slow-wave sleep,... [DOC] [TLE] Animal Survival in Extreme Temperatures - American Chemical ... [PAR] Cold-blooded animals do not maintain a constant body temperature. .... drops, 
breathing and heart rate slows, and most of the body's metabolic .... Some 
animals, such as hummingbirds, undergo a short-term hibernation known as 
torpor. ... If they didn't enter torpor at night they would die, since their bodies 
would lose too... [DOC] [TLE] How Hummingbirds Survive on Cold Nights [PAR] ... bears are a good example), torpidity is very short term, usually only overnight 
or for ... In 1950 Oliver L. Pearson noted that Anna's and Allen's hummingbirds 
enter torpidity. ... and concluded that hummingbirds do not become torpid every 
night. ... raise and lower their body temperatures and metabolic rates to survive in 
the... [DOC] [TLE] Hummingbird - Wikipedia [PAR] Hummingbirds are New World birds that constitute the family Trochilidae. They 
are among the ..... The metabolism of hummingbirds can slow at night or at any 
time when food is not readily available: the birds enter a hibernation-like, deep-
sleep state (known as torpor) to prevent energy reserves from falling to a critical 
level. [DOC] [TLE] That Long Winter Nap - Country Roads Magazine [PAR] Dec 23, 2014 ... Warm-blooded animals hibernate when the days grow shorter and the weather ... 
During the winter, the poorwill drops its body temperature up to sixty ... lower their 
metabolism and body temperature enough to technically be hibernating. ... 
Hummingbirds enter a state of torpor at night to conserve energy,... [DOC] [TLE] The Metabolism of Hummingbirds [PAR] On shorter experi- ments the ... a.n animal, the slower its rate of metabolism per 
gram of body weight. It is of interest, .... A female Anna Hummingbird found torpid 
on a lawn in. Oakland ... male from entering torpidity on the sixth occasion. Notes 
on the ... Night temperatures lower than 24 would be encountered .... SUMMARY
. [DOC] [TLE] The Metabolism of Hummingbirds - JStor [PAR] metabolism at rest and in flight and their energy needs over a 24-hour period. It 
has ... an animal, the slower its rate of metabolism per gram of body weight. It is o 
.... A female Anna Hummingbird found torpid o .... Night temperatures lower than 
24' w ... entering and emergin shorter in the. Allen and, as in the. Anna. These diff
. [DOC] [TLE] Energy Costs and Temporal Organization of Torpor in the Rufous ... [PAR] During steady-state torpor, $\dot{V}o_{2}$ reached its lowest value at a ... of the 
arousalphase peaked at approximately 8 C, decreasing at both lower and ... at 
night in nature, rufous hummingbirds can save energy by entering torpor even if 
they ... Hummingbird body temperature during torpor usually does not fall below 
the... [DOC] [TLE] Very low force-generating ability and unusually high temperature ... [PAR] SUMMARY .... Furthermore, it is known that hummingbirds can enter torpor at 
night (Kruger et al. ... of hummingbird flight and leg muscles at lower 
temperatures, to determine ... Samples of the fast-twitch tibialis anterior and slow-
twitch soleus muscles ... The pectoralis fibers from each bird species had very 
short mean SLnull... [DOC] [TLE] Timing of the daily temperature cycle affects the critical arousal ... [PAR] SUMMARY ... Bats entered torpor overnight and aroused the next day at a time ... 
The critical Ta (and torpid Tb)

Question: At night hummingbirds enter torpor, a short version of this, in which temp. lowers & metabolism slows
Answer: hibernation