Bird Sudoku Level 86 Hint
Pick a row, column, or habitat with a low remaining count, then check which of its perch cells are blocked by open diagonal flight lines.
Bird Sudoku Level 86 Strategy
Medium Level 86 uses a 8x8 board with 21 perch cells, 7 blockers, and 8 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 86 Solution
Bird positions in the solution: R1C6, R2C6, R5C8, R6C2, R7C5, R7C7, R8C1, R8C3, R8C7.