Bird Sudoku Level 186 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 186 Strategy
Expert Level 186 uses a 10x10 board with 41 perch cells, 13 blockers, and 10 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 186 Solution
Bird positions in the solution: R1C3, R3C10, R4C1, R4C6, R4C7, R5C9, R6C2, R7C2, R7C8, R7C9, R9C8, R10C2, R10C3, R10C10.