Genus Ascaridia refers to a group of parasitic nematodes found in the intestines of birds and some reptiles. There are several synonyms used for the same, including Ascaris-filariformis, Ascaris-galli, Ascaridia-bursata, and Ascaridina-bursata. These synonym names are used based on morphological, genetic, and ecological differences between the species. The Ascaridia parasites can cause severe health issues in birds, especially loss of appetite, weight loss, and reduced laying capacity, which can ultimately lead to death. However, these parasites are easy to prevent and treat, with timely veterinary intervention and proper sanitation measures.