Grails are not vertebrates, as they are nonliving. There is a family of birds called rails (Rallidae) which are vertebrates.

The rails, or Rallidae, are a large family of small to medium-sized birds.

A Zapata rail is a bird from the family Rallidae, with the Latin name Cyanolimnas cerverai.

A Calayan rail is a flightless bird from the family Rallidae which inhabits Calayan Island in the Philippines.

An African crake is a species of bird, Latin name Crex egregia, from the family Rallidae.