Acorn Naturalists Nature Circles® activity guides consist of a collection of creative cards filled with ideas, activities, and identifications. Each set contains introductory cards, science activity cards, resource cards, and field identifications and descriptions, with all of them clipped together (but also individually removable if you wish). Acorn Naturalists latest Nature Circles® cards were developed to address the Next Generation Science Standards (NGSS) with activities that call out the specific standards by the NGSS reference number. Also available are Nature Circles® cards covering pond and stream life, scat and tracks, animal and bird skulls, outdoor education activities, schoolground-based activities, plant and animal life cycles, and early childhood nature education. Nature Circles® cards are well researched, compact, and convenient for both field and classroom use.