REPTILIA: SQUAMATA: BOIDAE: Boa

Boa constrictor (Linnaeus, 1758)

Boa constrictor

Photo & text by Dr. Robert Sprackland.

 
This is an example of the Hogg Island color phase of the boa constrictor.

Range: Northern Mexico south to central South America.

Diagnosis: Boa constrictors are squarish-bodied snakes with slightly keeled scales, a triangular head that is longer than broad, laterally-placed eyes and a distinct dorsal pattern (see photos).

Description: Although the name "boa constrictor" has become synonymous with "giant snake," adults from most populations rarely exceed 12 feet/3.1 meters in total length. The record length is 18 feet/5.6 meters

Natural History:

Reproduction: Boas are prolific live-bearing snakes that may have 12-60 young. The exact number is often related to a combination of size and food supply.

Taxonomy & Relationships:

Variation: Tremendous variation exists in boas, leading to a confusing and controversial set of subspecies. The tendency of hobbyists to crossbreed these subspecies makes any meaningful study of taxonomy dependent upon field work, a daunting task.

Additional Comments:  Their tameness, relatively small size (in captivity) and easy-going disposition make boas among the most popular and commonly kept reptiles as pets and exhibit animals. Only the southern subspecies, the Argentine boa, is considered potentially nasty in captivity.

Type Specimen:

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