Primary Nests Expand It is important not only to be able to recognise the Asian hornet but also to be able to recognise the primary nest of the species. This looks looks very similar to a wasp nest and starts off about the size of a tennis ball and grows throughout the spring/summer. It may be found be in garages, sheds, woodstores and sides of building etc. If you have found something similar - please contact your local Asian Hornet Action Team, which you can find details of here.