Assertion: avian reptile | /r/Desires | external sources of heat
Facets:
value: often
type: TEMPORAL
Source sentences:
text: Modern non-avian reptiles exhibit some form of cold-bloodedness (i.e. some mix of poikilothermy, ectothermy, and bradymetabolism) so that they have limited physiological means of keeping the body temperature constant and often rely on external sources of heat.