### animal:

Ectotherm
* Most ectotherms have metabolism
  - slow metabolism
  - live in environments
* Most ectotherms rely on environments
  - external environments
* Most ectotherms use external heat
  - metabolic heat
* Some ectotherms affect development
  - can also be homeotherms
* Some ectotherms gain energy
  - heat energy
  - have environments
  - hold breaths
  - produce heat Flying insects use their flight muscles to produce heat
* Some ectotherms rely on heat sources
* also can allow their body temperatures to fluctuate up and down more than endotherms can
  - use burrows as a means to keep warm in the cold desert nights
* are animals that primarily gains heat through the environment
  - considered to be particularly vulnerable to climate warming
  - favoured in warm climates
  - more able to reduce their metabolism during times of low food availability
  - organisms that control body temperature through external means
* can change their behavior in order to adapt to freezing temperatures
  - devote a larger portion of their energy to growth than endotherms can
* can generally be active over a wider range of temperatures than endotherms can
  - survive better in resource-poor environments
* derive body heat from their surroundings or their behavior.
* develop body heat from external environmental sources.
* dont have much insulation- heat can be absorbed from environment quickly.
* generally obtain heat from their external environment.
  - no internal heat regulation mechanism like endotherms
* include fish.
  - cells
  - corpi
  - cytoplasm
  - ears
  - plasma membranes
  - vacuoles
* is an animal
* maintain their core body temperature primarily by utilizing environmental heat.
* make up all the other animals.
* regulate body temperature by seeking an environment with the appropriate temperature
  - their temperature with behavioral changes as well
* rely on external environments
  - sources for body heat
  - specific behaviours to regulate their heat gain and heat loss
* require less energy than endotherms because a. their muscles are very efficient.
* typically have a slower metabolism.
  - sources of temperature to regulate their body temperatures
* usually keep warm by muscle activity or by sunning.
* vary markedly in their limits of freeze tolerance.

### animal | ectotherm:

Many ectotherm
* Most many ectotherms live in environments.
* Some many ectotherms hold breaths.

Ectothermic animal
* Most ectothermic animals absorb heat.
* include reptiles.

Endothermic animal
* Most endothermic animals generate heat.
* Most endothermic animals have areas
  - surface areas
  - require energy
* are born much more under developed than ectothermic animals.
* depend on aerobic metabolism for most of their vital functions.
* have a continually high requirement for food to fuel the heat generation
* rely on themselves to produce their own heat.

Exotic animal
* are located in zoos.
* belong in the wild.
* have special needs and are more difficult to care for than domestic animals.

Experimental animal
* Most experimental animals have dietary requirements
  - vitamin c requirements
* deteriorate rapidly on pasteurized milk.
* predict human results.

Familiar animal
* Many familiar animals have four legs.
* occurring in the medusa body form include jellyfish
  - polyp form include sea anemones, hydras, and corals