Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to feed a cockatoo [title] Purchase pellets formulated for cockatoos. [step] Pellets are made from ground nuts and seeds and are formulated to meet your cockatoo's dietary needs. While your bird will not want to eat only pellets, it's important that most of its diet be made up of pellets.

Ending1: [substeps] Pellets usually come sold as pellet meal, flakes, or baby pellets. Do not use pellets containing additives, which can make your cockatoo sick. Ending2: When you purchase pellets, make sure to read the instructions on the packaging. [substeps] Be careful with as many pellets you choose to feed your cockatoo. Ending3: Check the ingredient list on the nutrition recommendation package to determine which pellets will best meet your cockatoo's needs. [substeps] Pellets should not be considered kitchen staples. Ending4: Birds can easily suffer from malnutrition if they don't eat a balanced diet. [substeps] Pellets should make up about 60% of the bird's diet.

Answer format: ending1/ending2/ending3/ending4