Assertion: birdcall | /r/CapableOf | end in slow trill
Facets:
Source sentences:
text: The song is a loud string of clear down-slurred or two-parted whistles, often speeding up and ending in a slow trill.
text: When close to the nest, his song is often softer; and when he’s with a female he sings a longer song that starts off fast and slows down at the end.