Walk along almost any port that handles livestock exports and you’ll notice something odd: the ships look a lot like car carriers. Tall, boxy hulls. High freeboard. Almost no portholes. A silhouette built for stacking, not for passengers. That’s not a coincidence. A large share of the world’s livestock carrier fleet didn’t start out moving sheep and cattle at all — these vessels began life as Pure Car and Truck Carriers (PCTCs), the same ships used to ferry new vehicles across oceans.