what are the most aggressive smaller species?

From my experience, out of the Conures.. it is the Sun Conures that are most aggressive. Both towards other birds but mostly to humans. However, I may have just purchased Sun Conures who had issues.. Haven't bred them myself as I dislike them personally because of the few that have been nasty towards em and other people I know.

Indian Ringnecks seem to get fairly aggressive as well. But that's just my experience.
 
I know you didn't list this bird but parrotlets are HIGHLY territorial with any other type of bird, but can make excellent pets
 
Our plumhead is quite aggressive towards other birds and will chase birds twice its size. It opens its beak and "growls" but never actually uses its beak. Our princess parrot will also chase other birds away from treats, but he uses bluff and size plus some noise as he has a deformed beak! Quite funny sometimes and 'tiels and others will "call his bluff" and he retreats very quickly, deciding discretion is the better part of valour:)
 
If you count Caiques as being a smaller species, they can be insanely aggressive with other birds.

Parrotlets, budgerigars and lovebirds also tend to be very territorial and aggressive as well.

My sun conure... yes also aggressive and incredibly territorial with certain people and other animals. He sees the cat or the dogs and he struts down grunting threateningly. He hates my uncle above all other people (for no reason, honest, lol poor uncle), and will nearly fly across the room to attack him, given the chance -_-
 
My Sun is a total sweetheart. He's cuddly and sweet. Now my Green Cheek is quite aggressive. You have to watch "how" you touch her, so as not to cause offense. Trixie is jealous and territorial. She doesn't like hubby. She flies to bite him and draws blood. Sometimes I think that she's a grumpy Zon trapped in a Green Cheek's body.
 
I have to go with Parrolets and Lovebirds!!!! Lories can be that way too, my Black Lory is not afraid to go attack a big bird if he gets the chance. He did it one day when he escaped his cage while the big birds were out and about, he flew towards them to attack. I happen to witness it so his cage doors are shut tight while the other birds are out.
 
I know you didn't list this bird but parrotlets are HIGHLY territorial with any other type of bird, but can make excellent pets

Amen to that statement! Kiwi can be a real stinker. But we love her :09:
 
Our whiteface 'tiel, Arial, is very aggressive towards my wife lately. I think it's a breeding behaviour. He spends his day on the verandah, where other birds are aggressive towards him (the eccy pulls his crest, and corella has grabbed tail several times). When he comes in in the evening he flies at George, the budgie, who gets "in his face". The other birds are usually in their cages, but if they're out he usually ignores them, even female 'tiel Ziggy.
 
I have heard that about the parrotlets and the lovebirds. I'm sure there are variations and each bird is unique but I have heard as a general rule they can be more aggressive.
My sun was not aggressive at all but she was wired to be more overcautious and fearfully vigilant, which did cause her to sometimes lash out. I never thought of it as aggression, but simply fear, like being 'hard wired' to be more fearful and reactive. (new toys being put in HER cage, she held her wings out and lunged and hissed at them. strangers who came to touch her would definitely have a bite, but she would never just go after anyone, only if they came at her and scared her.) I felt bad because everyone called her a 'bad bird' but she truly wasn't. She was quite sweet when she was at ease.
 
Caiques and Lorries are very aggressive towards other species. But that doesn't mean they do not make great pets . You just have them out by themselves ;)
 
I have heard that about the parrotlets and the lovebirds. I'm sure there are variations and each bird is unique but I have heard as a general rule they can be more aggressive.
My sun was not aggressive at all but she was wired to be more overcautious and fearfully vigilant, which did cause her to sometimes lash out. I never thought of it as aggression, but simply fear, like being 'hard wired' to be more fearful and reactive. (new toys being put in HER cage, she held her wings out and lunged and hissed at them. strangers who came to touch her would definitely have a bite, but she would never just go after anyone, only if they came at her and scared her.) I felt bad because everyone called her a 'bad bird' but she truly wasn't. She was quite sweet when she was at ease.

I hate it when people misinterpret things, like your conure :(
My grandmas friend had a goat (they had lots of cows, goats, ducks, etc.) that was horned, and they kept him tied up with a rope around his neck, and called him "the evil goat", when really he just wanted to be loved on but his horns caused him to hit people :( it's sad when people are like that



I can't add for what's aggressive towards humans/birds, but our little ringneck is a darling, and has been pretty perch aggressive, but she's getting better. I haven't been able to work on the food aggression, however.
 
I had a great ten minutes watching a cage at the local shop with three parrotlets and a pair of cockatiels the other day. All but one of the parrotlets contentedly sat on perches chilling out, the remaining bird being a real little rotter who seemed to spend his time charging up and down the perches bullying the others out of the way whenever he wanted to get past. Eventually he came up against the bigger cockatiel, who wasn't having any of it. Parrotlet would snap and lunge, cockatiel would lunge back with the air of a strict schoolmaster putting a rowdy boy in his place, parrotlet would look embarrassed and back off. Pause for thirty seconds, parrotlet would regain his poise, go on the attack again and get the same response... they were still going strong when I left the room.
 

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