Visitor in the USA.

[Wompet]

As promised, I talked to the Fish and Wildlife inspector today. Her answer was to obtain a CITES Pre-Convention Permit (which, of course, does not have an application online). You would still be subject to inspection and verification by USFWS at your port of entry into the U.S..
Looking at the USFWS permits website, it mentions that application review takes at least 60 days, with applications concerning marine mammals and/or endangered species taking at least 90 days to review.
I hope this helps.