First, calcium deficiency: this is mainly due to long-term indoor feeding, there will be calcium deficiency such as thin eggs or eating eggs. At this time, you can add egg skin to the feed, or put some lime wall dander in the food waste. Second, enteritis: sick birds are characterized by loose hair, drooping wings and thin white pulp feces. This is caused by unsanitary feeding, especially when vegetables are unclean or contain moisture, which is easy to cause diarrhea. Therefore, vegetables should be washed and dried before feeding. At onset, furazolidone 0.0 1% (per tablet 1000 ml of water) can be added to drinking water, and it can be cured for 3 consecutive days. Third, skin diseases: mostly caused by excessive humidity and darkness. Pay attention to dryness and ventilation. Budgerigars are very cold-resistant. They often put birds in the outdoor sunshine. Be careful not to let the sun shine directly in summer to avoid heatstroke. I wish your budgerigar an early health.