Ascaridia /æskəˈrɪdiə/ is the name of a genus of parasitic nematodes. Members of the genus are primarily intestinal parasites of birds. There are three well known species, namely, A. galli found mostly in chicken, A. dissimilis in turkeys, and A. columbae in pigeons. Lesser known species such as A. hermaphrodita, A. sergiomeirai, A. ornata, A. nicobarensis and A. platyceri are found in parrots. The eggs of A. dissimilis is marginally bigger than A. galli and A. columbae in marginally smaller. All these ascarid eggs are very similar in appearance to Heterakis gallinarum.