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