Does bird pellet size matter?

I have a Blue Quaker - along with 4 other birds.

I am not a fan of pellets. Yes - they make financial sense because they have 100% of what a bird needs....... but would you want to eat the same brand and flavor of cereal morning, noon, and night? Quakers are the only bird that build nests on the planet - all the other parrots will use a hole in a tree they find or make - so these are a bird that are in constant motion, constantly building. They do not like change. But they also do not like boring food. Pellets - are boring - especially to a Quaker.

My Quaker gets a dish full of cut up veggies and fruits on a bed of broccoli slaw every morning. His favorite veggie is sugar snap peas - quakers are not that fond of fruit like other parrots. We still put them in his bowl simply because the act of moving the fruits he doesn't eat does touch what he will eat and that provides some nutrients. We keep several dishes of a conure mix in his cage and outside his cage.

Besides regular food - my quaker has a serious thing for salt and any pork product. Chips and fries from McDonalds - he will eat forever if I let him. He is frequently by my side at dinner and is almost a well mannered friend - unless bacon is around..... he has ripped off the bun, tossed off the tomatoes, lettuce, and grabbed the bacon off my burger and run across the table laughing as he goes. BBQ smoketed and pulled pork is a favorite - so are chicken, turkey, and ham. Noodles - most any pasta - put him in a happy place. Same with potatoes - fried or baked - he's a happy camper with a mouth full.

Considering how varied their taste pallet is - I think you would have a very unhappy bird with just pellets.

Generally the pellets will have guidelines on them as to what birds they are recommended for.

My flock eats Harrison's. The cockatiels prefer the fine size, though technically they should be eating the next larger size up.

Some companies give free samples, check their websites.