Conception Bank Silver Boa

Conception Bank silver boas have silver to tan dorsal background coloration, with or without scattered dark brown scales. Ventral scales are pure cream-white. Juveniles undergo ontogenetic color change, from a light brownish-orange coloration with heavy patterning as neonates to the adult coloration around 400-500 mm snout-vent length. They measure 88–103 cm (35–41 in) in snout–vent length and weigh 182–258 g (6.4–9.1 oz). Tail length varies between 18 and 21 cm (7.1 and 8.3 in). There is one loreal scale, 275–282 ventral scales, 82–91 subcaudal scales,11–12 supralabial scales, and ten circumorbital scales. Males and females do not differ in the shape of their heads, although males might have slightly larger eyes relative to body size.

The Conception Bank silver boa is largely arboreal and has been found in silver palm Coccothrinax argentata and gumbo-limbo Bursera simaruba. It is thought that the species mostly feeds on birds, with juveniles possibly feeding on Anolis sagrei lizards.The species is known from six individuals encountered in July 2015 by a research team from Harvard University, and from the type series of two individuals collected in October 2015. A total of 49 individuals have been observed by researchers between 2015 and 2017.

The Conception Bank silver boa is a featured part of the story in T.C. Boyle's novel Blue Skies. The discovery of the Silver Boa and researcher R. Graham Reynolds are featured in the book Bill Nye's Great Big World of Science.