Mijbil the Otter

He went wild with joy in the bathtub, He learned to turn on the tap, He made a lot of splash and noise

The story describes how Mijbil loved water - he went wild with joy in the bathtub, learned to turn taps, and made lots of splash. The text mentions that otters like to keep water moving and find still water boring.

Five days

The text mentions that Maxwell's friend left after three days of trying to get communication with England, and Maxwell arranged to meet him in a week's time. Five days later, Maxwell's mail arrived.

A small medieval dragon covered in mud

Maxwell describes the creature that emerged from the sack as resembling 'most of all a very small, medievally conceived, dragon' because it was coated with symmetrical pointed scales of mud armor.

Marbles, Ping-pong balls, Rubber fruit, Terrapin shell

The text specifically mentions that Mij would play for hours with ping-pong balls, marbles, rubber fruit, and a terrapin shell. Marbles were his special favorites for juggling on his back.