Within the same genus (Cervus):
* Red Deer: Closely related to elk, and sometimes considered the same species.
* Sika Deer: Another species within the same genus, found in Asia.
* Thorold's Deer: A critically endangered deer species found in China, also within the same genus.
Other deer species:
* Fallow Deer: Found in Europe and North Africa, sharing some similarities with elk.
* White-tailed Deer: A common North American deer species.
* Mule Deer: Another common North American deer species, known for their large, branched ears.
* Reindeer: A large deer species adapted to cold climates.
More distant relatives:
* Moose: The largest member of the deer family.
* Caribou: A large, migratory deer species found in the Arctic.
Elk are fascinating creatures with a diverse and interesting family tree!