The Ascension Night Heron disappeared in the 16th century.

Ascension Night Heron, Nycticorax olsoni (extinct)

Given the fact that Thévet allude to a flightless bird named Aponar in 1555, it could be quite possible that he referred to the Ascension Night Heron.

The Ascension Night Heron (Nycticorax olsoni) is an extinct Night heron species from the genus Nycticorax endemic to the South Atlantic island of Ascension.

A possible report on the Ascension Night Heron is found in the chapter "D'une isle nommte I'Ascention" in the travel report Les singularitez de la France antarctique by André Thévet.

Ascension Night Heron, Nycticorax olsoni (extinct)

The Ascension Night Heron (Nycticorax olsoni) is an extinct Night heron species from the genus Nycticorax endemic to the South Atlantic island of Ascension.

Several prehistoric bird species named after Storrs Olson, including Nycticorax olsoni, Himantopus olsoni, Puffinus olsoni Primobucco olsoni, Gallirallus storrsolsoni, and Quercypodargus olsoni.