Final answer:
In the tundra, many nesting birds sing from high in the air is not a true statement.
Step-by-step explanation:
The correct statement is: In the tundra, many nesting birds sing from high in the air. This statement is not true because in the tundra, nesting birds tend to nest close to the ground and sing from low perches rather than high in the air. This behavior allows them to communicate and defend their territory more effectively in the flat, open landscape of the tundra.