Question: In what ocean is the island in which were found subfossil remains of the Henderson ground dove? 
Sentence (from "Sulawesi ground dove"): The Sulawesi ground dove ("Gallicolumba tristigmata") also known as yellow-breasted ground dove is a medium-sized, approximately 35 cm long, olive-brown ground dove with golden forehead, yellow breast, red legs, iridescence bluish-green crown ended with purple patch behind ear coverts, dark brown tail and white below.
Relevant evidence: No