One day I brought a praying mantis cocoon into the library and left it - in a jar- on the Information Desk for patrons to observe. But when I arrived one afternoon for my evening shift, I found it gone and the staff in hysterics. Bugs! Bugs! all over the library. Hmmmm. evidently it had hatched and the babies were small enough to crawl out of the holes I had punched in the lid. oops.
And then there was the ant farm I put on display -- also a failure -- I used wild ants from around the library and they crawled out the holes. Should have tried to find larger ants.
Trials of a children's librarian.