1800 Prenesting 28 April 1981 1500 δ561♂ g | NI - 1505 " | NI - 10 "? | NI - 15 " | NI - 20 (core3 δ562g) | NI - 25 " | NI - 30 δ476 | NI - 35 core3 others g | NI - 40 Core3 sap tree | NI - 45 core3 +others g | NI - 50 9564 δ564 9565 g |core elsewhere - 55 ? | NI - 1600 δ561 9565 g | core elsewhere - 1605 δ564 others g | NI - 10 δ564 others g | NI - 15 (core3 δ564 others (?))g | NI - 20 core3 δ564 9565 g | NI - 25 " | NI - 30 core3 g δ561 9565g | NI - 35 (core3 others g) | NI - 40 9565 δ564g | core elsewhere - 45 δ561 δ564 g | (other?) core elsewhere - 50 core3 9565 δ561 g | NI - 55 " | NI - 1700 " | NI - 29 April 1981 1800 prenesting behavior 1640 core3 δ562 g | NI - 1645 core3 sap tree, others g | NI - 1650 core3 δ562 δ564 sap tree | NI - 1655 core3 g | NI - 1700 core3 2og | δ564sap | NI - 05 δ564g | core elsewhere - 10 δ564δ562 sap tree | core elsewhere - 15 core3 δ562 g, δ564sap tree | NI - 20 core3 others g | NI - 25 core3 9565 near g | NI - 30 " | NI - 35 core3 δ562 sap tree | NI - 40 ? | NI - 45 δ564sap tree othersg | NI - 50 core3 others g | NI - 55 " | NI - 1800 " | NI - 05 " | NI - 10 " | NI - 15 core3 g | NI - 20 " | NI - 25 " | NI - 30 " | NI -