Listened in

• Detected, as a group of animals will be here
• Used a radio
• Downloaded some tracks from, say
• Learnt (of)
• Caught wind
• Learned via the grapevine
• Picked up from the air
• In one ear?

WordNet Word definitions in WordNet
v. perceive (sound) via the auditory sense get to know or become aware of, usually accidentally; "I learned that she has two grown-up children"; "I see that you have been promoted" [syn: learn , get word , get wind , pick up , find out , get a line , discover ...