Watch first, choose second
Resist pointing at the prettiest colour in the first minute. Stand back and watch the whole group for ten minutes or more, because flock behaviour is the best health screen you will get for free. In a settled group, budgies squabble briefly over a perch or a spray of millet and then get on with feeding, preening, and chattering. The bird you need to notice is the one for whom the squabbling never stops: chased from each perch he tries, lunging at whenever he approaches food, or sitting apart while the others feed. Flock birds often drive away a sick companion, so persistent bullying can be an early warning, not just bad luck.
Reading the bird at the back
Not every quiet budgie is a problem, so look closer before you decide. A bird that is simply resting will sit sleek, open his eyes when you move, and rejoin the group to feed. The worrying picture is different: feathers fluffed for warmth, eyes half closed in daylight, tail bobbing with each breath, dried droppings or staining around the vent, and a position low in the cage or on the floor. That bird may be ill, may be a very youngster not yet feeding independently, or may be a hen being harassed by too many males. Whatever the cause, he needs the seller's attention and possibly a vet — not a trip home with a first-time owner.
What a good pick looks like in the group
Choose the bird in the middle of the action rather than at either extreme. He feeds shoulder to shoulder with others and holds his place politely, flies or hops between perches with coordination, and shows bright, clear eyes, a clean cere, smooth, unbroken feathers. Curiosity is a bonus: a budgie who watches you, tilts his head, or cheeps back is already showing the temperament that makes taming enjoyable. Avoid the opposite extreme too — a bird that bullies everyone else relentlessly may be a handful and a poor future companion for a second budgie.
Ask the seller what the group can tell you
A good seller knows their birds as individuals. Ask how long this group has been together, whether the quiet bird at the back has been seen feeding, and whether the birds are related and their approximate ages — a young bird with clear bars on the forehead is far easier to tame than an adult. Ask if you can return or exchange if a vet finds a problem in the first days. A seller who answers openly and agrees the back bird needs checking is a seller you can trust about the healthy one you are taking.
The first days with the bird you chose
Let your budgie settle in his own cage near household activity, with food and water at perch height while he learns the layout, and keep handling gentle and brief until he eats comfortably in front of you. Note his droppings, appetite, and favourite foods from the start. His breeder or shop notes belong with those first observations — KinsLe Transferrable Profiles carry that early information across with his profile, so nothing about the bird you chose so carefully is lost between the shop and home.