A Chart Supplement airport remarks section reads, in part: "Numerous non-radio acft operating in area. Birds on and invof arpt and within a 25 NM radius." What is the purpose of this kind of remark?

Why: This remark appears in the Chart Supplement excerpt for Pierre Regional Airport (PIR) under "AIRPORT REMARKS." The Chart Supplement's remarks section is where this kind of hazard information — including bird and wildlife activity — is published for pilots to review before operating in the vicinity of an airport.

• Inverts the remark's meaning: a wildlife-activity note warns of a known hazard; it does not certify the absence of one.
• Confuses the AIRPORT REMARKS field with the separate WEATHER DATA SOURCES field in the same Chart Supplement entry, which reports altimeter/weather sources, not wildlife activity.