Seed: -7133220840044486188
Coordinates where birds disappear OW -> Nether
OW portal coords	Nether portal coords		Coords birds tp to (nether)	# of birds
1134 75 -351		151 88 -52			1130 75 -349			2/10
1039 79 -3200		134 83 -397			1039 80 -3197			2/10

Coordinates where birds correctly travel through the portal
OW portal coords	Nether portal coords		
-1000 69 3001		-123 74 372

Seed: 5130415253217361179
Coordinates where birds disappear OW -> Nether
OW portal coords	Nether Portal Coords		Coords birds tp to (nether)	# of birds
-6 64 -8006		13 49 -1017			-12 63 =8002			2/10
4000 67 -8001		508 52 -1007			3993 74 -8010			3/13
998 64 8		130 68 0			995 64 6			8/14
-998 89 997		-125 89 124			-996 88 992			2/14
3 77 1001		11 74 119			4 75 1004			12/18
1002 64 976		131 53 129			1002 66 976			28/30
4000 92 8000		498 64 986			4003 90 8000			6/10
7998 73 8006		1006 65 992			7996 74 8005			19/20
-8000 67 8000		-999 74 995			-7996 65 7995			1/4

Coordinates where birds disappear Nether -> OW
OW portal coords	Nether portal coords		Coords birds tp to (OW)		# of birds
-8000 67 8000		-999 74 995			-1005 77 992			5/18
-4000 82 8000		-510 87 1011			-507 88 1012			1/26
999 64 -999		121 81 -110			121 81 -103			5/10

Coordinates where birds correctly travel through the portal
OW portal coords	Nether portal coords		# of birds tested
-8000 73 -8000		-1011 94 -1003			50	
-9 64 8002		1 69 995			10
-7999 91 4000		-986 72 507			10
8000 84 4000		1000 83 499			20
8000 63 0		1008 72 8			10
8000 73 -8000		994 72 -1001			10
8000 82 -4000		1004 94 -503			10
-7992 73 12		-1002 66 9			10
-1001 119 0		-112 57 -10			10
-1 64 -1000		3 84 -138			10
-998 70 -1002		-138 56 -116			10
-8000 97 -1001		-1009 59 -123			10
-8000 69 -4001		-1004 83 -501			10
-4007 120 -8002		-492 88 -990			10