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