This ability of some hair helps protect the eyes from foreign particles in their surroundings
What is tactile sense?
100
Both hair and feathers can respond to loss by this function
What is regrowth?
100
Absence of hair
What is alopecia?
100
The layer of the hair that is visible to the naked eye
What is the cuticle?
100
The difference between fur and hair
What is none?
200
A type of movement in which penguins use smooth feathers on their bellies to help them glide on the snow
What is topagganing?
200
This protein induces the hair papilla to project into the hair bud
What is SHH?
200
Alopecia is caused by these factors
What are genetics, malnutrition, or illness?
200
The hollow shaft at the center of the feather, also known as the quill.
What is the calamus?
200
This bird has the most feathers per square inch
What is the penguin?
300
Some animals can use this function of their hair to hide from predators
What is camouflage?
300
Most follicles of the bird develop within this amount of days
What is 12 days?
300
Adult birds will spread PBFD in these ways
What is feces, feather loss, in vitro?
300
As the hair grows away from the hair bud, it undergoes this process
What is keratinisation?
300
The reason male peacocks have brightly colored feathers?
What is mate attraction/selectivity?
400
Birds living in the snow have feather covered feet that increases surface area and prevents sinking
What is snow shoeing?
400
Growth of the dorsal side of the feathered papilla is rapid and establishes these two surfaces
What is the dorsal and the ventral side?
400
Premature babies might show signs of this type of hair
What is lanugo hair?
400
This type of the feather is separate from the calamus and is attached to the wings
What is the rachis?
400
Feathers used as bait in fishing are also used for this fashionable purpose
What is hair accessory
500
Feathers and hair have this use in common (at least 2)
What is protection from heat and maintenance of body temperature and camouflage?
500
The melanocytes which provide pigmentation to the hair shaft are housed here
What is the hair bud?
500
The hemaglutination test checks for the presence of the PBFD causing virus by seeing if antibodies are present in the sera. Without antibodies, the virus causes the red blood cells to do this
What is aggregation?
500
Hair buds of this type of follicle extend in the hypodermis and have contact with free nerve endings.
What is sinus hair follicle?
500
This stage of hair growth allows hair to both grow and fall out