passenger pigeon

• 已灭绝的鸽子（Ectopistes migratorius），曾大量分布于北美，以庞大群体的迁徙闻名。现常作比喻，指已灭绝或过时的事物。

An extinct species of pigeon (Ectopistes migratorius) that was once abundant in North America, known for migrating in enormous flocks. The phrase is now used metaphorically to refer to something that has become extinct or obsolete.

1. Extinct bird speciesB2formalamerican

   A species of pigeon (Ectopistes migratorius) that was once abundant in North America but became extinct in the early 20th century due to overhunting and habitat loss.

   已灭绝鸟类

   • The passenger pigeon once numbered in the billions across North America.
   • Martha, the last known passenger pigeon, died in 1914 at the Cincinnati Zoo.
   • The extinction of the passenger pigeon is a famous example of human impact on wildlife.