If a _katupong_ flies in at one end of the house and flies out at the other, it is a bad omen, and the house is often abandoned. On one of my visits to Sebetan there was great excitement at the Dyak house near mine because on the previous night a _katupong_ had flown through the house. Opinions were divided. Some thought the house ought to be abandoned; others said that if sacrifices were offered, there was no need to desert the house. My opinion was asked. At that time of the year the Dyak house was very empty, as most of the families, if not all, would be living on their farms, and I said: “You have fruit-trees growing thickly all round your houses, and as you leave your houses empty, I am not surprised at any bird flying through the house.” My matter-of-fact ideas were not much approved. As usual in doubtful cases, they sacrificed a pig and examined its liver. Luckily, the omen was good, so they continued to live in the house; otherwise, they would have had to leave that house and build another. To see a drop of blood on a mat or on the floor of a Dyak house is considered a bad omen, which sometimes necessitates the abandoning of the house altogether. I remember hearing a woman of this same house in Sebetan relate that, after she and the children had had their evening meal, she was putting away the plates on the rack in the wall, when she saw a drop of fresh blood on the mat. The Dyaks considered it a most terrible thing to happen. I was asked what I thought about it. I said that probably one of the children had a cut finger, and the blood was from that. The mother was positive the blood was not that of any of her children. I said that perhaps there was a wounded rat in the roof, and the blood was from it. I could see that the Dyaks considered me very ignorant. They told me that they were sure the blood must be that of some spirit who chose that method of showing his displeasure. It was useless for me to argue that if the spirit was invisible, his blood must be invisible, too. To kill one of these omen creatures, be it bird or insect, is a crime which will certainly be punished by sickness or death. But this sacredness of life, it may be noticed, does not apply to the deer, the gazelle, the mouse-deer, the armadillo, and the iguana, all of which they freely kill for food. Rats also are killed, as they are great pests. It would seem that physical requirements are stronger than religious theory.