### body part | spine:

Sharp spine
* Some sharp spines deter animals.
* Some sharp spines penetrate human skin
* are present on the veins and stems.
  - the back of the hedgehog
* deter livestock, and presumably wildlife, from grazing.
* grow along the leaf margins and extend down the branches and stems.
* line the mantid's raptorial forelegs, enabling it to grasp the prey tightly as it eats.
* makes it hard for other fish to swallow.

### body part:

Spiracle
* Most spiracles have tracheae
  - tubules
* Some spiracles are behind eyes
  - closed by valves
* are an insect's breathing pores
  - attached to the tube called trachea
  - external openings of the tracheal system
  - holes in body wall that let air into tracheal tubes
  - located on the abdomen and thorax
  - openings to the tracheae
  - orifices
  - present posterior to the eyes
  - reduced or missing in active pelagic sharks
* cribriform with C-shaped peritremes.
* cribriform, lacking closing apparatus, concavities of respiratory plates oriented ventrad
  - with closing apparatus
* includes corpi.
* is an orifice
* run along the sides of all insects and are the holes through which they breathe.
* send air to numerous tracheae.

### body part | spiracle:

Blowhole
* are a whale's nostrils and are located on the top or back of the whale's head
  - formed by erosion
  - like nostrils
  - openings in the volcanic rock where breaking waves blast water into the air
  - part of cetaceans
  - vertical faults which have been widened by wave attack
* can eventually erode the area surrounding the crevices to form larger sea caves.
* have the capacity to change the topography near their locations.
* help to distinguish modern forms of whales.
* lava tube which was formed beneath the ocean millions of years ago.

### body part:

Tail
* Most tails act like fifth limbs
* Most tails have length
  - muscles
  - tips
  - help animals
* Most tails produce oil
  - sound
  - vary in length
* Some tails are supported by ossify tendons
  - bury in sand
* Some tails consist of cartilaginous materials
  - feathers
  - few feathers
  - soft feathers
* Some tails have black fur
  - dark plumages
  - filament
  - fine fur
  - flat shapes
  - flight feathers
  - glands
  - lobes
  - long filament
  - orange feathers
  - outer feathers
  - poisonous spikes
  - scent glands
  - shaggy fur
  - sharp spikes
  - stingers
* Some tails have white feathers
  - wool
  - help predators
  - produce substances
  - serve as legs
* alone can bind to the surface of the bacteria.
* are also part of the social status and an area for fat storage
  - appendages
  - followers
* are located in backs
  - monkeys
  - mechanical devices
  - organs
* are part of cats
  - coin
  - fuselages
  - vertebrates
  - processes
  - projections
  - rears
  - reverses
  - spies
* are used for signaling
  - wags
  - usually the darkest color on the individual animals
* enable birds to maneuver around.
* extend from abdomens
  - posteriors
* have characteristics
  - conspicuous white tips
  - dark brown tips
  - distinctive black tips
  - balance the body, especially during ambush pounces on prey
* hold backs.
* move from positions.
* presumably bind to specific other molecules that are the cargo.
* produce loud sound
* serve purposes.
* show fluffs.
* support animals.
* take up about a third of their total body length.
* tend to show the place or function of the horse.

### body part | tail:

Black tail
* Most black tails have tips.
* Some black tails have feathers
* are normal in many sub-species, with white spotting on the ears, chest and legs.

Bobtail
* are tails.
* come in shorthaired and longhaired varieties.

Comet tail
* are expansions of the coma
  - like signatures for individual comets
  - millions of kilometers long
  - often very long
* point away from the Sun, regardless of the direction in which the comet is traveling.