(Un)identified Caterpillars on Brassicaceae: Evergestis isatidalis
I have recently seen a lot of caterpillars of the same species that I can't identify and will collect all the observations here.
2023/02/25: I found a nest of caterpillars in a web spun around the flower heads of some Brassicaceae:
https://www.inaturalist.org/observations/149666877
2023/02/25: This is the foodplant, where the caterpillars were found.
https://www.inaturalist.org/observations/149666891
2023/02/25: another plant, which I believe is the same species, flowering
https://www.inaturalist.org/observations/149666890
2023/03/01: Photos during the day of caterpillars inside their nest
https://www.inaturalist.org/observations/150005914
2023/03/07: I saw bigger caterpillars on the same plants at night, one was hanging from a silk thread (as a means of hiding from me)
https://www.inaturalist.org/observations/150532773
I think I can safely assume that it is Evergestis isatidalis, since I've seen these photos:
https://naturdata.com/especie/Evergestis-isatidalis/32501/0/
The plant has meanwhile been identified as Sinapis alba