list daySounds = ["wren", "thrush", "blackbird", "robin_w", "Hsparrow", "Bluetit"];
list nightSounds = ["Tawny Owl", "shortear owl","42917__inchadney__Owl"];
float gVolume = 1;
list nightAmbient = ["wind"];

default {
    state_entry() {
        llStopSound();
        llSetTimerEvent(0.5);
    }

    timer() {
        vector time = llGetSunDirection();
        list myList;
        float density = 0.9;

        if (time.z > 0.0) {
            myList = llListRandomize(daySounds, 1);
        } else {
            myList = llListRandomize(nightSounds, 1);
            density = 0.98;

            // Ambient nighttime sound
            if (llFrand(1.0) > 0.85) {
                llStopSound();
            } else {
                llLoopSound(llList2String(nightAmbient, 0), gVolume);
            }
        }

        if (llFrand(1.0) > density) {
            llTriggerSound(llList2String(myList, 0),gVolume);
        }
    }
}