In this episode, we expose notorious freeloaders that have mastered the art of parasitism in animals — some with the power to cross into human lives. From the segmented sprawl of Moniezia expansa in young ruminants to the stubborn persistence of Parascaris equorum in foals, we unravel how these internal invaders thrive at the expense of their hosts. Then, we head to the canine world, where Ancylostoma caninum (hookworm) and Toxocara canis (roundworm) reveal a darker zoonotic side — one that can affect humans, especially the young and immunocompromised.