There's a witches' cauldron on our beach

 
There’s a witches’ cauldron on Ngarunui Beach.
Have you seen it?
Three dinosaur eggs lie inside, smooth as stone.
 
Enormous nobbled creatures have populated the beach.
They wallow in their shingly sea.
Are they waiting? Will they rise?  
 
 

See the eye, the claw, the gristle spine, the grinding jaw.
 
The tide makes whales of the sandbanks
Grey backs breach and bask
Swimming for the hills.
 
Lone stone posts dot the shore
Like gnomes hats
They wig-wag in the breeze.
 
Footprints, imprints, tail slide, broom whisk
There’s a witches’ cauldron on Ngarunui Beach
Dare you see it?
Don’t fall in it!