list daySounds = ["American Oriole", "Cardinal", "Red-tailed Hawk", "Robin", "Song Sparrow", "Tree Swallow", "Locust"];
list nightSounds = ["Great Horned Owl"];

list nightAmbient = ["Cricket"];

default {
state_entry() {
llStopSound();
llSetTimerEvent(2.0);
}

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), 1.0);
}
}

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