What's eating my narcissus?

[Jack Meatcher]

This year a number of my narcissus have had their coronas eaten by something. I think it may be an insect after the nectar. Yesterday, an exchange seed N. bulbocodium graellsii flowered for the first time (sown in 2012). To-day it had been destroyed by something eating the corona. Any ideas as to what is doing it so that I can develop a defence strategy? My plants all grow open to the elements as I've yet to assemble an Access frame.

Jack

[Hoy]

In my garden it is snails and slugs that eat the corona of daffodils.

[Anthony Darby]

I used to go out at night with a pair of old scissors and cut dozens of slugs in half.

[Jack Meatcher]

Gentlemen,

Thank you for your replies. I had thought it might be bumble bees but you've put me in the correct direction. Many thanks.

Jack