The dark bill is heavier than that of the related, slightly smaller, tropical kingbird. An adult tropical kingbird is long and weighs . The NYSOA publishes "The Kingbird", a quarterly journal of ornithology. The adult gray kingbird is an average-sized kingbird. There, he discovered the species that were known as Couch's kingbird and Couch's spadefoot toad. Cassin's kingbird and the western kingbird are similar in appearance. The western kingbird ("Tyrannus verticalis") is a large tyrant flycatcher. The name "kingbird" is derived from their "take-charge" behaviour. Say's phoebe, ash-throated flycatcher, Cassin's kingbird, and western kingbird are also found. The single was produced by Ian Broudie under the pseudonym Kingbird. The tropical kingbird ("Tyrannus melancholicus") is a large tyrant flycatcher. Most spectacular have been western kingbird (fall 2005) and Kirtland's warbler (fall 2004). The eastern kingbird ("Tyrannus tyrannus") is a large tyrant flycatcher native to North America. Cassin's kingbird ("Tyrannus vociferans") is a large tyrant flycatcher native to western North America. He also has one bird species named for him&colon; "Couch's Kingbird".