Lark is an adult, female speed archaeopteryx living in the hollow mountain with the Hattori Clan and Masanari Black Flowers. She is the sister to Lorikeet and Robin and often serves as a mount to top agents of the MBF for transportation. She has streaked yellow-brown plumage with white tail feathers and a short crest. She can hover and frequently rockets up into the sky when flying.
- Her name derives from the bird of the same name.