Bird Sudoku Level 247 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 247 Strategy
Master Level 247 uses a 10x10 board with 43 perch cells, 13 blockers, and 8 habitats. Use the row and column counts first, then test each open diagonal flight line.
Bird Sudoku Level 247 Solution
Bird positions in the solution: R1C4, R1C6, R2C2, R4C2, R5C7, R6C5, R6C7, R6C10, R7C1, R7C3, R8C1, R9C7, R10C5, R10C9.