Scientists have reported a strange twist in the tale of Europe’s harbinger of spring the Common Cuckoo Cuculus canorus. In a dramatic discovery, returning cuckoos have been heard and filmed calling with a highly distinctive variation of the normal call. The new call is best described as “Ooo-Cuck, Ooo-Cuck”.
UPDATE: April Fool’s day …
Britain: Cuckoo numbers down by nearly 60%: here.
Reed warbler vs. cuckoo: here.