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Food source
* Many food sources exist for squirrels in their natural surroundings.
* Most food sources have little iodine, but iodized salt dietary source.
* Most food sources increase antler growth
* Some food sources are whole and skim milk, bananas, prunes, and raisins.
* Some food sources contribute to intake
  - sodium intake
  - vitamin d intake
* Some food sources have different values
* Some food sources provide food
  - necessary nutrients
* are better than supplements because they are generally better absorbed
  - fish, grains and nuts
  - large and diverse
  - limited because of the harsh climate and difficult storage conditions
  - plentiful from land and sea
* are present in the form of human waste, food waste and other simple organic material
  - wastewater in the form of human waste, ground garbage, oils grease, etc
  - starches, grains, fruits and vegetables
  - the best way to get calcium
* can be anything from dry wall and insulation to carpeting or mattresses.
* contain all eight compounds
  - other nutrients such as calcium, protein and some essential fatty acids
* have a significant effect on calcium absorption
  - different nutritional values
* include seeds
* range from sweets to protein-based foods.
* varies depending on which region the peccary inhabits.
* vary by season, location and availability.
* vary, but typically any small insects they catch in their webs.

Headwater
* are beginnings.
* is critical habitat for many species, several of which are threatened or endangered
  - the largest unprotected ancient redwood forest remaining in the world

Heat source
* Most heat sources receive heat.
* Some heat sources create heat
  - provide freeze protection
* are located in bedrooms
  - cars
  - fire
  - homes
  - houses
  - solar energy
* are used for cooking food
  - greenhouses
  - relaxing muscles
  - thawings
  - warmth
* help spark the wildfire and bring fuel to temperatures hot enough to ignite.
* is interior of earth.

Historical source
* are the clues to fitting a story together.
* indicate that demand for rhino horn was significant in the medieval period.

Natural source
* Most natural sources have super-Gaussian density.
* Some natural sources contribute to microwave radiation
  - provide habitats
* are from plant
  - yeast and fish liver oil
* can also play a significant role in pollutant production
  - be from plants such as marigold, chili, or corn
* complex mixture of organic and inorganic compounds.

Noise source
* can also come from exterior sources such as aircraft and highway traffic.
* represent unwanted environmental sounds.
* vary in digital cameras.

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Point source
* Many point sources dispose of their wastewater via pipe discharges to a nearby water body.
  - fixed pollution sources such as electric power plants and refineries
  - large stationary sources of emissions
  - pipes, culverts or similar single points from which phosphorus is released
  - places with a point of discharge, such as a pipe, directly into water bodies
  - sources that have a specific location
  - typically industrial discharges of waste gases and aerosols to the atmosphere
* emit sound.
* have extent.

Power source
* Most power sources use fuel.
* Some power sources provide electrical power

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Primary source
* are documents or artifacts from a person, place or event in history
  - documents, objects, or traces of the past which come from the era being studied
  - materials written, printed or recorded during the period of time being studied
  - original documents written or created that are useful in historical analysis.
  * It is used as an original source of information about the topic. In library and information sciences, primary sources are generally regarded as those sources closest to the origin of the information or idea under study. Primary sources are distinguished from secondary sources, which often build upon primary sources