Bird Sounds from Around the World - including the Cuckoo

This is a fantastic website, with bird sounds from around the world.

http://www.xeno-canto.org/

Including the declining, but remarkable, Cuckoo.

http://www.xeno-canto.org/species/Cuculus-canorus

Read about the BTO's current Cuckoo appeal.

http://www.bto.org/support-us/current-appeals/cuckoos/cuckoos-appeal

And, the fabulous Nightingale

http://www.xeno-canto.org/species/Luscinia-megarhynchos