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Unit 2: Warm Blood


Oct 12 @ 2pm: Online Class Ages 10 and Up

Oct 12 @ 3pm: Online Class Ages 6-9

Oct 19 @ 2pm-4pm: In Person Class Ages 10 and Up 

Oct 21@ 2pm-4pm: In Person Ages 6-9

Note: Curriculum resources will be available through Oct 25 for additional learning options.


Animals such as humans, lions and bears have the ability to regulate their own body temperature despite the temperature of their environment. These animals have historically been called "warm blooded." 

BUT, scientists have found that cold-blooded animals do not always have “cold” blood, in fact their body temperature could vary dramatically depending on the environment! Scientists no longer use "cold blood" and "warm blood" because they don’t adequately describe the variations in temperature control found in nature. Scientists now use these terms: Endotherms and Ectotherms.

Endotherms are animals that keep their body temperature stable as a result of their metabolism, a word for the chemical activity in their cells. (Humans are an example) Cells are like tiny machines that make chemicals for energy and growth. However, like all machines, they lose some energy as heat. Endotherms have developed systems involving fat, sweat glands, fur and feathers to retain heat or release it to the environment.

Ectotherms are animals that don’t have the ability to retain the heat generated by their metabolism. When it’s cold outside, the metabolism of ectotherms slows down, as does their ability to move. That’s why reptiles, butterflies and other ectotherms can be found “sunning themselves” in the morning. Doing this raises their body temperature and allows the chemical activity in their cells to speed up.

Curriculum will be different for the two classes: Ages 6-9 and Ages 10 & Up 

Lets learn about how Endotherms & Ectotherms are different, and how they survive!
Animals You will Meet: