Recently fledged young or downy young. This includes dependent young only. Be cautious of species that range widely soon after fledging. One of the best features to look for is the length of the tail feathers. If shorter than the adults, the young probably originated locally.
Young cowbirds begging for food confirm both the cowbird and the host species.
Adult bird carrying food for young or feeding recently fledged young. Use this code with caution. Some adults carry food a long distance or may be engaged in courtship feeding. Others such as the Common Grackle or Blue Jay may carry food away to consume it themselves. One of the best signs to look for is the repeated carrying of food in the same direction.