Bird Sudoku Level 191 Hint
Look for perches that share long open diagonals. If no blocker sits between two possible birds, those placements cannot both be used.
Bird Sudoku Level 191 Strategy
Expert Level 191 uses a 9x9 board with 38 perch cells, 11 blockers, and 9 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 191 Solution
Bird positions in the solution: R1C6, R3C2, R3C3, R3C5, R3C6, R4C8, R5C2, R6C5, R7C3, R8C1, R8C9, R9C4, R9C7.