### location | environment | habitat:

Aquatic habitat
* Many aquatic habitats contain rock which provides structure and cover for fish.
* include rivers.
* includes marshes, oxbow lakes and flooded fields.
* is improved due to decrease in organics, and chemicals in runoff water.
* suffer enormously from sprawl.
* vary from clear mountain streams to low country swamps.

Artificial habitat
* comes in all shapes and sizes.
* differ from naturalistic habitats in that they are set up more simply.

Coastal habitat
* are especially vital to threatened and endangered species.
* extend from the shoreline to the edge of the continental shelf.
* include beaches.

Critical habitat
* is all necessary for the recovery of the species
  - applied to areas deemed necessary for a species' conservation and recovery
  - land considered crucial to the survival of creatures on the brink of extinction
  - the area occupied by steelhead or essential to the survival of steelhead
* term used in the Endangered Species Act.

### location | environment | habitat:

Den
* Most dens are created by animals
  - other animals
  - lined with leaves, grass, or rotted wood
  - only large enough to accommodate a bear when it is curled up
  - oval shape, six to nine feet long and about six feet in height and width
  - contain individuals
* Most dens have at least two openings
  - entrances
  - underwater entrances
  - provide shelter
* Some dens have branches
  - entrance holes
  - several branches
* are an important resource to octopus during all benthic life stages.
  - burrowing into soil under rocks
  - hidden in areas, such as a hollow log or in a hole dug under the roots of a tree
  - holes in tree trunks, which are also lined with soft material
  - in every family
  - just large enough for bears to squeeze into
  - lined with dry moss or fur for warmth
  - located in hollow logs or under logs, stumps, roots, brush piles, or rocks
  - made in rock caves, rabbit burrows and hollow logs usually close to a water source
  - of two types depending on water level fluctuations
  - small caves usually in rock or other areas, where the dog feels at home
  - typically tunnels that extend six to fourteen feet into the earth
* are used for protection, sleeping and breeding
  - shelter and raising young
* are usually hollow stumps, tree cavities, or wherever there is shelter
  - in rocky outcroppings in the hills, or in deep animal burrows
* can be considerably cooler than outside air temperatures
  - hollow trees, rock crevices or piles of leaves on the ground
  - underground or above ground, even in hollow trees or in the branches of dense trees
* generally describe holes or burrows that foxes dig in the dirt.
* have entrances
* include holes.
* is habitation
* offer protection from cold and wet weather and safety from predators.
* often serve as shelters for foxes.
* protect newborn cubs from winter's temperature extremes.
* provide safety and protection from the elements
  - security
* tend to drop all their leaves and leave nothing but the cane.
* usually consist of a system of burrows beneath a rock-overhang or cliffs.
* vary greatly in size, sometimes accommodating entire communities of hyenas.

Different habitat
* Most different habitats grow orchid plants
* Some different habitats provide enough sunlight
* are home to different animals.
* have different characteristics.
* provide homes.
* tend to support different species.

Fish habitat
* Many fish habitats are described in relation to water temperature.
* are downstream of many impacts, and fish integrate the effects
  - the many complex ecological environments that support our fisheries resources

Forest habitat
* Some forest habitats are preferred by deer
  - mule deer
* are areas covered mostly by trees.

Fragmentation of habitat
* continues to increase on both breeding and wintering grounds.
* reduces the chances of successful breeding.