A bova is a crocodile. A dax is a gerbil. Question: Which one of them has rough skin? Answer: bova.
A wug is a monkey. A kiki is a heron. Question: Which one of them can live near the water? Answer: kiki.
A toma is a cat. A glorp is an owl. Question: Which one of them is feline? Answer: toma.
A blick is a hawk. A tufa is a buzzard. Question: Which one of them is kept in falconries? Answer: tufa.
A fep is an eel. A flib is a moth. Question: Which one of them can be found in seas? Answer: fep.
A zek is a mussel. A zup is a squid. Question: Which one of them is a cephalopod? Answer: zup.