TYPE OF BLOOD
"All amphibians are cold- blooded, however they inhabit different climates. Some become uncomfortable if removed from the tropics, while others can become frozen solid, defrost and survive. "
taken from: http://www.answers.com/Q/Do_amphibians_have_cold_blood
taken from: http://www.answers.com/Q/Do_amphibians_have_cold_blood
Amphibians are cold blooded because half of there life is in the water Cold -blooded Reptiles and Amphibians Amphibians became the first vertebrates to live on land, and like their "cold-blooded" reptile relatives, depend on external energy sources (such as the sun) to maintain their body temperatures. This, combined with their slow metabolism, make reptile and amphibian lifestyles and abilities dramatically different from their mammalian counterparts.
Mammals (and birds) are endotherms, which means they generate heat internally, through a high metabolic rate, and usually maintain a fairly high and constant body temperature regardless of ambient temperature (within reasonable limits); this is often called being "warm-blooded."
taken from http://nationalzoo.si.edu/Animals/ReptilesAmphibians/cold_blooded.
Mammals (and birds) are endotherms, which means they generate heat internally, through a high metabolic rate, and usually maintain a fairly high and constant body temperature regardless of ambient temperature (within reasonable limits); this is often called being "warm-blooded."
taken from http://nationalzoo.si.edu/Animals/ReptilesAmphibians/cold_blooded.