“Using newly developed powders, fingerprint experts were able to lift some useable prints up to 28 days after they were deposited on rhino ivory, hippo teeth and sperm whale teeth.” (http://uk.whales.org/news/2015/11/new-fingerprint-techniques-could-foil-whale-tooth-poaching)
South Africa has “moved around 100 rhinos to unspecified neighboring states as part of efforts to stem the illicit slaughter of the animals for their horns. … For security reasons, the precise countries where the rhinos had been moved would not be named.” (http://uk.reuters.com/article/2015/01/22/us-safrica-rhinos-poaching-idUKKBN0KV1HN20150122)
Where do you hide a rhino? Well away from dark horners.