 Two bleeding-hearts are kept as pets and may escape on Tawi-Tawi; the Sulu bleeding-heart differs from the Luzon bleeding-heart by not having the Luzon bleeding-heart's purple nape and back, and from the Mindanao bleeding-heart by lacking prominent gray wing-bars and an orange belly.The Sulu bleeding-heart's vocalizations have never been described.The Sulu bleeding-heart is endemic to the island of Tawi-Tawi and its nearby islets in the southwestern part of the Philippines's Sulu Archipelago.