Ectotherms will increase their body temperature mostly through external heat sources such as sunlight energy, therefore they depend on the occurring environmental conditions to reach operational body temperatures.
42.
However, the question of whether sauropods were endothermic or ectothermic plays a major part in how sauropods were muscled, as endotherms have particularly more intestines and stomach than ectotherms.
43.
There is no compelling physical evidence for pterosaur endothermy and it is becoming increasingly apparent that many early birds, although fully capable of powered flight, may well have been ectotherms.
44.
The fecundity advantage hypothesis states that a larger female is able to produce more offspring and give them more favorable conditions to ensure their survival; this is true for most ectotherms.
45.
During periods of cold, some ectotherms enter a state of torpor, in which their metabolism slows or, in some cases, such as the wood frog, effectively stops.
46.
They have a four-chambered heart and, somewhat like birds, a unidirectional looping system of airflow within the lungs, but like other non-avian reptiles they are ectotherms.
47.
Ectotherms are unable to survive in extremely cold temperatures ( around 0.7 degrees Celsius ) as their internal body temperature must match the outside temperature and cannot handle very cold temperatures.
48.
In their view, ectotherms with less surface to volume would heat up and cool down more slowly, and this resistance to temperature change might be adaptive in " thermally heterogeneous environments ".
49.
Thermoregulation, in combination with seasonal acclimation, describes the major mechanisms of how ectotherms ( " T . carnifex " included ) cope with the changing temperatures existing in their environments.
50.
Because ectotherms depend on environmental conditions for body temperature regulation, they typically are more sluggish at night and in the morning when they emerge from their shelters to heat up in the first sunlight.
