Their scales were red and gold, glittering in the light of the fire.
As the Doctor and Donna stood on the sandy shoreline of an alien beach, a bonfire dancing merrily nearby, locals enjoying the view, Donna's face was turned into amazement.
'Doctor, are you telling me that these are real, they shouldn't exist, but I'm seeing them with my own two eyes!'
'Yep, they are real' He grinned, as mermaids frolicked through the water.