What this shows:

Each row is a species. Each square represents a day of the year.

Tip: Look down a column to see what birds are likely on that specific day.

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Color meaning:

• Darker green – more frequently reported
• Lighter green – occasionally reported
• No color – rarely or never reported

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How to use it:

• Scan vertically to see what birds are likely on a given date
• Scan horizontally to see when a species is most active

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Data is based on historical checklist frequency in Essex County.