EUROPEAN HORNET:
General Information:
https://en.wikipedia.org/wiki/European_hornet#Life_cycle
Lifespan and reproduction:
https://www.orkin.com/stinging-pests/hornets/european-hornet
Eggs to Adults:
https://www.hampshire-waspcontrol.co.uk/hornet-lifecycle.php
Colony and Nest Info:
https://hgic.clemson.edu/factsheet/european-hornet/
https://en.wikipedia.org/wiki/European_hornet#Life_cycle
https://www.extension.iastate.edu/news/2006/oct/070901.htm
Nest photo:
https://en.wikipedia.org/wiki/European_hornet#/media/File:Hornets'_nest.jpg
Hornet Photo:
https://www.entomon.it/en/european-hornet-vespa-crabro/
Location Photo:
http://www.vespa-crabro.com/hornets.htm
Sting and defense mechanisms:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3707105/
https://en.wikipedia.org/wiki/European_hornet#Life_cycle
https://en.wikipedia.org/wiki/European_hornet#Life_cycle in "Alarm behavior" section.