The literature regarding the seet call of the American Robin (Turdus migratorius) is unclear as anecdotal accounts indicate it is an aerial alarm. A more recent, comprehensive account indicates it is most likely a contact call. We examined the meaning of seet calls through observations and a playback experiment, both of which support the aerial alarm function of the call. Robins only gave seet calls to aerial predators and many engaged in skygazing, a behavior previously unreported for robins. Robins engaged in three anti-predator behaviors, skygazing, alert, and scanning for significantly more time after hearing an alarm compared to hearing a control. American Robins, like many other birds, probably evolved this call to avoid detection by aerial predators and to warn conspecifics.