diff --git a/Cargo.toml b/Cargo.toml
index 4cae79d0..7157229d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,3 +29,9 @@ git = "https://github.com/servo/rust-core-foundation"
 
 [target.x86_64-apple-darwin.dependencies.core_foundation]
 git = "https://github.com/servo/rust-core-foundation"
+
+[target.i686-apple-darwin.dependencies.core_graphics]
+git = "https://github.com/servo/rust-core-graphics"
+
+[target.x86_64-apple-darwin.dependencies.core_graphics]
+git = "https://github.com/servo/rust-core-graphics"
diff --git a/src/lib.rs b/src/lib.rs
index d8c546a9..f1f8d5ab 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -37,6 +37,8 @@ extern crate libc;
 extern crate cocoa;
 #[cfg(target_os = "macos")]
 extern crate core_foundation;
+#[cfg(target_os = "macos")]
+extern crate core_graphics;
 #[cfg(target_os = "linux")]
 extern crate sync;
 
diff --git a/src/osx/mod.rs b/src/osx/mod.rs
index 3e0d668a..3dda56aa 100644
--- a/src/osx/mod.rs
+++ b/src/osx/mod.rs
@@ -22,6 +22,9 @@ use {MouseInput, Pressed, Released, LeftMouseButton, RightMouseButton, MouseMove
 
 use events;
 
+pub use self::monitor::{MonitorID, get_available_monitors, get_primary_monitor};
+
+mod monitor;
 mod event;
 
 static mut shift_pressed: bool = false;
@@ -43,26 +46,6 @@ impl Deref<Window> for HeadlessContext {
     }
 }
 
-pub struct MonitorID;
-
-pub fn get_available_monitors() -> Vec<MonitorID> {
-    unimplemented!()
-}
-
-pub fn get_primary_monitor() -> MonitorID {
-    unimplemented!()
-}
-
-impl MonitorID {
-    pub fn get_name(&self) -> Option<String> {
-        unimplemented!()
-    }
-
-    pub fn get_dimensions(&self) -> (uint, uint) {
-        unimplemented!()
-    }
-}
-
 #[cfg(feature = "window")]
 impl Window {
     pub fn new(builder: WindowBuilder) -> Result<Window, String> {
diff --git a/src/osx/monitor.rs b/src/osx/monitor.rs
new file mode 100644
index 00000000..383fd322
--- /dev/null
+++ b/src/osx/monitor.rs
@@ -0,0 +1,46 @@
+use core_graphics::display;
+
+pub struct MonitorID(u32);
+
+pub fn get_available_monitors() -> Vec<MonitorID> {
+    let mut monitors = Vec::new();
+    unsafe {
+        let max_displays = 10u32;
+        let mut active_displays = [0u32, ..10];
+        let mut display_count = 0;
+        display::CGGetActiveDisplayList(max_displays,
+                                                        &mut active_displays[0],
+                                                        &mut display_count);
+        for i in range(0u, display_count as uint) {
+            monitors.push(MonitorID(active_displays[i]));
+        }
+    }
+    monitors
+}
+
+pub fn get_primary_monitor() -> MonitorID {
+    let id = unsafe {
+        MonitorID(display::CGMainDisplayID())
+    };
+    id
+}
+
+impl MonitorID {
+    pub fn get_name(&self) -> Option<String> {
+        let MonitorID(display_id) = *self;
+        let screen_num = unsafe {
+            display::CGDisplayModelNumber(display_id)
+        };
+        Some(format!("Monitor #{}", screen_num))
+    }
+
+    pub fn get_dimensions(&self) -> (uint, uint) {
+        let MonitorID(display_id) = *self;
+        let dimension = unsafe {
+            let height = display::CGDisplayPixelsHigh(display_id);
+            let width = display::CGDisplayPixelsWide(display_id);
+            (width as uint, height as uint)
+        };
+        dimension
+    }
+}