Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to improve a bird's diet [title] Do research on your bird. [step] Find out what kinds of food is specific to your bird's diet. For example, if you have a pet sparrow, you should feed it seeds, corn, and grains to keep it healthy.

Ending1: [substeps] Avoid feeding your bird unhealthy food. It will damage the bird's digestive system and lead to negative health consequences. Ending2: If you will be introducing a new bird to your home, you will need to decide what kind of food to feed your bird. You may opt for the whole grain bird chick, lope or budgie. Ending3: If you have a chicken, see if it is fully grown. [substeps] If you don't live near a chicken farm or if you don't know your bird well, contact an avian vet for vaccinations. Ending4: [title] Use food from your bird's diet. [step] Buying a bird's natural food is easy, but if your bird has a specific diet, you will need to work on improving its diet as much as possible.

Answer format: ending1/ending2/ending3/ending4