Adult male gorillas 'sing' and 'hum' during supper
Gorillas also 'sing' and 'hum' frequently while eating food, says a new study.
Feb 25, 2016, 21:29 PM IST
Gorillas also 'sing' and 'hum' frequently while eating food, says a new study.
Feb 25, 2016, 21:29 PM IST