I spotted this paper wasp nest on my walk today. Torn open like this, I assume it's an old one. The wasps build these papery looking structures by mixing dead plant fibers with saliva.
Thank you to @whatisnew for hosting #insectday and #butterflyday every Thursday.
References
An Introduction to Paper Wasp Nests
Images
Photo taken with my Canon SX620 HS in Kanata (Ottawa), Canada