||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