Do you mean when you are putting food in their food bowls or when you are handing them food? Where are they when you are feeding them? What kinds of birds are they? (the pics that I see are upside down for some reason...looks like maybe a quaker?? and I can't tell the other one??) How old are they and how long have you had them?
Not sure if I can help but I'm sure someone on the forum can...they are great!
Our birds are rescued Quakers. They attack as we are trying to get the food bowls out and when we are putting them back in. Nibbly is the really aggressive one and Bobo is a monkey see monkey do and is just now starting to act the same way as Nibbly. It is funny though, he first started attacking at the treat bowl. When he did I would keep the bowl out but put it where he could see it. I would attempt again a minute or so later. If he attacked again I would again put the bowl somewhere else. It didn't take long for him to wait and not attack when I was replacing the treat bowl because the treat bowl is the one they love and they eat first. Of course once the bowl is in and I try to lock the door to the bowl he'll start attacking, once he has what he wants.
Bobo was rescued first, in 2004 when she was found injured and someone took her to the wildlife center where they partially amputated the wing. She screamed a lot so the wildlife center suggested a mate. Nibbly was only 3 months old when we got him in 2005. Nibbly has become very aggressive in the past two years, since Bobo had to start living in a separate cage next to him because of a neck wound he kept "helping her" with. The helping part started two years before that when Bobo somehow clipped a big swing during the night and we assume hurt herself because she suddenly started tearing at her chest. A few botched surgeries and several thousand dollars later this is what we have. Even if we thought it would be okay now that Bobo has healed we can't put them together because Bobo now "helps" Nibbly with his beak, she breaks pieces off and then he gets infections. The vet said Nibbly's beak is deformed, it grows as if on steroids and we have to dremel it down every few weeks. So now we live with two large birdcages and a mess in double the space because they can't live together but they also can't bear to be apart.
I should add that in Florida they were very happy. We had to move to Georgia and they had a cage change to a temporary one and they were still happy. But, the day we brought another large permanent cage in the house and started moving they toys over Nibbly suddenly started plucking himself. He is a couch potato, doing very little in the way of playing in the cage. Bobo on the other hand is a worker and moves everything that can move, pieces of leather I have hanging, calculator paper, toys, etc. several times a day because at least once a day I undo everything while I tell her what a beautiful job she's done.
One other problem, they SCREAM when we are in the kitchen both fixing their food and at night ours. I think a solution would be moving their cages so they couldn't see the kitchen but still would they scream if they heard us? I say they but there again it is Nibbly and then Bobo follows the leader. I tell her all the time she doesn't have to succumb to peer pressure but she does anyway!
I know that over the past 6 months I've been I'll in my bed so not in the living room with them like I used to be. I don't know if that can contribute to the problem or not. Unfortunately another move is in our future, in the next couple of months we are moving to Colorado so they will have to be in a travel cage, uh oh, maybe cages hmmm I'll have to think about that one.