You can review these illustrated verses in a wider context by proceeding to 'Immersible Verse: Limericks about Waterfowl' on the full-service blog 'Edifying Nonsense'.
ruddy turnstone at a narrow Carolina beach-strip
littered with oyster-shells. This bird is a long distance migrator, roosting in the high Arctic.
shorebird, seen near Toronto lakeshore: killdeer?
turnstones (running), and oystercatcher