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Delaware Valley Ornithological ClubGrackles kept up a continual creaking while they waited for late arrivals. At 6.45, five minutes after sunset, all left in three compact flocks at

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Page 1: Delaware Valley Ornithological ClubGrackles kept up a continual creaking while they waited for late arrivals. At 6.45, five minutes after sunset, all left in three compact flocks at
Page 2: Delaware Valley Ornithological ClubGrackles kept up a continual creaking while they waited for late arrivals. At 6.45, five minutes after sunset, all left in three compact flocks at
Page 3: Delaware Valley Ornithological ClubGrackles kept up a continual creaking while they waited for late arrivals. At 6.45, five minutes after sunset, all left in three compact flocks at
Page 4: Delaware Valley Ornithological ClubGrackles kept up a continual creaking while they waited for late arrivals. At 6.45, five minutes after sunset, all left in three compact flocks at
Page 5: Delaware Valley Ornithological ClubGrackles kept up a continual creaking while they waited for late arrivals. At 6.45, five minutes after sunset, all left in three compact flocks at
Page 6: Delaware Valley Ornithological ClubGrackles kept up a continual creaking while they waited for late arrivals. At 6.45, five minutes after sunset, all left in three compact flocks at
Page 7: Delaware Valley Ornithological ClubGrackles kept up a continual creaking while they waited for late arrivals. At 6.45, five minutes after sunset, all left in three compact flocks at
Page 8: Delaware Valley Ornithological ClubGrackles kept up a continual creaking while they waited for late arrivals. At 6.45, five minutes after sunset, all left in three compact flocks at
Page 9: Delaware Valley Ornithological ClubGrackles kept up a continual creaking while they waited for late arrivals. At 6.45, five minutes after sunset, all left in three compact flocks at