What's eating the onion leaves?

An allotment problem. Onions from sets are being damaged; their leaves cropped. Various feathered and furry pests abound. Pictures:

 

Never seen anything like that.
Rabbits?

 

It's very odd. Allotment wide. I have not been able to find any plots which are wholly protected (wire), so I can't tell whether or not wire stops whatever's doing it. Can't see footprints since these particular sets have been in for a while.

 

Im having the same issue though i have chickens roaming my plot too i have some of mine netted and they are untoutched

 

Do your nets just go around, or above too?

 

Above, i use mdpe pipe to make arches then put the netting over and peg down:

 

Ah. I suspect it's aerial attack.

 

There are a lot of pigeons on my site

 

Well. I've got 7 rows of Sturon and Setton ("improved Sturon") on the go. Removed the enviromesh which I'd had on to prevent attack. Next day one (!) onion had been clipped short. Literally one or two other leaves cropped, but no real problem. I think the plot is rabbit proof, so I'm going to say it's some wretched bird (guess: jackdaw).

 

I normally blame pigeons for this sort of damage.
Jackdaws are more omnivorous and also I like them.

 

Theres a large group of Jackdaws at my workplace, very nice birds, i also like them! Haha

 

I dont know about @Drahcir but my site isnt accessible to anything bigger than birds and rabbits, we also get the odd mink so my guess for the damage to my own onions is the pigeons that live around the site and the ones that live on site.