Cast or kettle?

In the English tradition of collective nouns, a group of hawks (yes, applied to birds but I've extrapolated) can be a kettle or a cast. It is safe to say I have certainly had a cast of Hawk-moths in the garden this year, with many nights with multiples of several species in the trap.

Dost thou love hawking?

Only one moth to the garden trap last night, actually clinging to the sheet, but one that marked the start of the Hawks for me, surely decent May weather must be round the corner?