Eurasian skylark
The crested lark is a songbird, and has a liquid, warbling song described onomatopoeically as a ' or a '. It sings in flight from high in the sky, at roughly above the ground. The related Eurasian skylark exhibits similar behaviour but also sings during its ascent, whereas the crested lark sings either at altitude or on the ground. Their flight pattern is an example of undulatory locomotion.