i heard through a friend that a friend of theres had a 2 year old budgie, they are due to move house within the next few weeks and they said if they dont find a home for it, it will go over the fence and set free, as i already have 3 i didnt really want any more but i couldnt let this happen so i have took him in. He looks really underweight, two of my budgies are around 8 months old and the other one is just over one. they are all pretty big budgies compared to this one. I have changed his seed to trill instead of the supermarket one and i have also put some vitamins in (which he is eating). he seems friendly and happy but my main concern is his weight. He also never keeps his beak closed is this normal, he is constantly opening and closing it, its not overgrown as i checked last night. Also, how long should i keep him seperated from the other three budgies. Luckily the cage is a big cage and big enough for 6 budgies so i know there is plenty of room.