Common True Katydid (Pterophylla camellifolia). 

This night-singing insect is commonly heard but seldom seen. It’s a master of disguise, with oblong green wing covers that are almost indistinguishable from a leaf. The camouflage is both necessary and appropriate, that’s because this katydid is very nearly flightless! It’s also arboreal, sticking to the tops of trees where it can hide amongst the foliage to feed. 

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Katydid audio clips recorded by Brodie Dunn 

Sources and more: 

• Common True Katydid. Songs of Insects. Available from http://songsofinsects.com/katydids/common-true-katydid. 
• Common True Katydid. Missouri Department of Conservation. Available from https://mdc.mo.gov/discover-nature/field-guide/common-true-katydid. 
• Common True Katydid (Pterophylla camellifolia). Singing Insects of North America (SINA). Available from https://orthsoc.org/sina/141a.htm.