In this episode we can see Félix and his crew, including biologist Carlos Sanz, capturing different owls and nocturnal raptors to implant a technological tracking system hidden in their plumage in order to observe their habits and behaviors. We can also see these raptors in full action, and the footage shows us the attributes that make them efficient hunters of the dark: mimetic plumage, silent flight, razor-sharp talons, and prodigious eyes.