Instruct: Classify Amazon reviews into positive or negative sentiment
Query: almost worthless

This is a fine concept, completely unrealized. I bought it for grandchildren, but it would insult their intelligence. Authors picked out a very few species of charismatic, or at least colorful caterpillars, and left it at that. They did not bother to mention that only two or three of these stars occur throughout the US. Nor do they bother mentioning that 3/4 of all caterpillars will become moths, not butterflies. Nothing useful about how to look for caterpillars. Peterson Guides should have hired someone who cared about caterpillars and kids at least a little.