well, I was thinking, the cuckoo and owl verses were portents - so my additional verses - rather than using Monica Grabins - are

when you see that red sky at mornin' (3x)
Shepherds and sailors take a warnin'

When you see that red sky at evening (3x)
Tomorrow's gonna be a bright new day

When you see those two magpies perchin' (3x)
It's a sign of joy, buddy, it's a sign of joy