How to smuggle an animal

We all know animal smuggling is difficult. You can be found out with just the smallest thing going awry...splashing sounds when smuggling fish, squawking when smuggling parrots, moving bags when smuggling snakes...or my personal favorite, and I can only assume the smuggler is an ex-clown...getting caught when alert police somehow discover you have 2 cows and 2 goats in your Fiat.