Terrapins and Eggs

I am looking after 3 terrapins.
It was Easter time and I had a large chocolate egg filled with foil covered mini eggs, around 50 of them.
I ate half of the big egg and decided to hide the remaining half together with all the mini eggs. Predators in the house you see.
But where?
Of course, float the half egg and contents in the terrapin tank.
Then I got hungry again.
Off to the tank to find the terrapins had scoffed the lot, 50 mini eggs, silver paper and all.
Only a fragment of the half egg floated forlornly.
A wreck.
Their owner would be furious, how could they survive eating all that armoured chocolate?
I got up and rushed through to the terrapins.
They were all alive and were still hungry.
No trace of the half egg either.