Is breá le Niall agus Conall cleasanna a imirt -- go háirithe ar Mhamaí! Ach céard a tharlaíonn nuair a thugann Daifní Dineasár cuairt orthu? An gcreidfidh Mamaí go bhfuil dineasár thuas staighre?

Niall and Conall love playing tricks -- always on Mum! But what happens when Daifní Dinosaur pays them a visit? Will Mum believe that there's a dinosaur upstairs? Sos 4