thunderbird

noun2

1. •
   A mythological bird, often associated with stormy weather, especially in various indigenous North American mythologies.

   • A man there was, grim his expression, just like a Thunderbird his features were frightening. — 1999
2. •
   The golden whistler, an Australian insectivorous songbird (Pachycephala pectoralis, formerly Pachycephala gutturalis), whose male is conspicuously marked with black and yellow, and has a black crescent on the breast.

noun1

1. •
   (UK) A locomotive stored at a strategic point on the network so as to be available to quickly rescue a failed train.