- They have a outer layer of keratin.
- They are primarily defensive structures.
- They are made of rapidly growing bone and are shed and regrown each year.
- They are always present in both sexes.
- sudoriferous glands
- sebaceous glands
- mammary glands
- musk glands
- epicuticle
- procuticle
- hypodermis
- basement membrane
- Larynx
- Syrinx
- Tracheal chamber
- Voice chamber
- Airfoil
- Parabronchi
- Bronchitis
- Air capillaries
- Geological hazards
- Meteorological hazards
- Hydrological hazards
- Extraterrestrial hazards
- Extinct in wild
- Critical
- Endangered
- Vulnerable
- Ecocentrism
- Biocentrism
- Anthropocentrism
- Surrogate measures
- Bonn convention
- Ramsar convention
- CITES
- ESA
- Basal zone
- Littoral zone
- Profundal zone
- Continental shelf
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