Circus cyaneus hudsonius

are host of

• Global Biotic Interactions: Holostomum variabile

are parasitized by

• Global Biotic Interactions: Holostomum variabile
• Global Biotic Interactions: Filaria serrata

are preyed upon by

• Global Biotic Interactions: Falco peregrinus Tunstall 1771 (Duck hawk)

eat

• Global Biotic Interactions: Oxyura jamaicensis (Gmelin & JF 1789) (Ruddy Duck)
• Global Biotic Interactions: Molothrus ater (Boddaert 1783) (Brown-headed Cowbird)
• Global Biotic Interactions: Thomomys talpoides (Richardson 1828) (Northern Pocket Gopher)
• Global Biotic Interactions: Microtus californicus (Peale 1848) (Amargosa Vole)
• Global Biotic Interactions: Pluvialis squatarola (Linnaeus 1758) (Grey Plover)

prey on

• Global Biotic Interactions: Pluvialis squatarola (Linnaeus 1758) (Grey Plover)
• Global Biotic Interactions: Fulica americana Gmelin & JF 1789 (American Coot)
• Global Biotic Interactions: Oryzomys palustris (Harlan 1837) (Marsh Oryzomys)
• Global Biotic Interactions: Fulica americana Gmelin & JF 1789 (American Coot)
• Global Biotic Interactions: Fulica americana Gmelin & JF 1789 (American Coot)