“Bio-Observer" by Maker horseboy on DIY.
A description of the project from the Maker:
bottles reused for caterpillars. theywill make cocoons to live through winter. in spring i will put them outside and i hope they will still be there and become butterflies. the bottles are cut in two and the top is put upside down in the bottom. there is earth in the bottom and the leaves of the plant that these caterpillars eat. i have three bottles, they are 3 different butterflies so 3 different kinds of plants. my mum helped me look up the kinds of caterpillars on a special website and i looked on wikipedia to find out more about the host plants.