Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
|  | Name | Date | Location | County | Description |
| --- | --- | --- | --- | --- | --- |
| 1 | Diamond Head |  | Honolulu | Oahu | State Monument |
| 2 | I'ao Valley |  | Wailuku | Maui | State Monument |
| 3 | Kanaha Pond | June 1971 | Kahului | Maui | Bird Sanctuary |
| 4 | Koʻolau Range Pali |  |  | Oahu |  |
| 5 | Makalawena Marsh | June 1972 | North Kona | Hawaiʻi | Bird Sanctuary |
| 6 | Mauna Kea | November 1972 | Saddle Road | Hawaiʻi | U.S. state high point |
| 7 | North Shore Cliffs | December 1972 | Molokaʻi | Maui |  |
Question:
what is the number of bird sanctuary landmarks?
Answer:
2