I have 3 male parakeets for almost 2 years and about a week and a half ago I found one dead on the bottom of the cage so I took him out burried him and replaced him with another(it’s my 3 year old son’s bird). New bird seemed fine and getting along with the other two birds. Three days later I find the new bird dead on the bottom of the cage. I just replaced him again on Monday and now this afternoon I come home to the new one once again dead on the bottom of the cage. There is no blood or feathers plucked. I don’t know if the other two are killing the third or what is happening. My the thought the first time was that he took a nasty fall from the perch but now two more have died it doesn’t make sense. Any thoughts or ideas as to what is happening is greatly appreciated.