International traffickers have tried many ways to smuggle African rhino horns to Asia, concealing them inside wooden Buddha statues, stashing horn pieces in lobster heads kept in a refrigerated container and disguising horn portions as the bases of painted statues. Now, conservationists say, some criminal groups are processing rhino horns into powder and trinkets before export, a trend that could reflect changing consumer tastes and make it harder for police to intercept the illegal cargo.