This is great fun and a nice progression from our Brush Robots!
Small motors are cheap at any electrical store as are the battery casings. I got mine from Maplins. Adding a plastic bottle top off centre causes the vibration. These can be easily and painlessly stopped with a finger while in motion. Here is a little video of one in action.
We’ve tried taping ours to margarine tub lids, paper cups, sponges and so on, observing each object glide across the floor. I was inspired to add the coloured pens to make three and four legged bots by this post from Science Buddies! I had to make adjustments to make it safe and accessible to 1-3 year olds. Thank You Science Buddies! It was great fun!
My favourite thing, Science and Art combined!
Equipment
Small motor
Battery casing with wires
Tape
Plastic cup or lunch box
Pens
Batteries
Plastic lid
Toddler
Paper
Enthusiasm
Science for toddlers!
Tiny Adventure 
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