Sink the Gizmo by Paul Jennings

Cal and Ricky both stare at the one-eyed seagull.
'You wanted food,' Ricky whispers.
'There is it.'
'A seagull? You'd eat a seagull?'
'I'd eat anything,' says Cal. 'Anything.'

When Ricky and Cal wag school they bite off more than they can chew.

The last.
The very last gizmo story.
From Australia's master of madness.