- Abies Magnifica (1)
- Acer Macrophyllum (1)
- Alder (3)
- Aleutian Islands (Alaska) (2)
- Alnus Glutinosa (1)
- Alps (4)
- Alps, Swiss (Switzerland) (4)
- American Golden Plover (2)
- American Merganser (2)
- Anaconda (1)
- Anas Carolinensis (3)
- Anas Clypeata (2)
- Anas Crecca (1)
- Andean Condor (1)
- Anhinga (1)
- Anhinga Anhinga (1)
- Animal Tracks (3)
- Animal Traps (1)
- Antlers (3)
- Aquatic Plants (2)