The western conifer seed bug loves to eat pine cone seeds. Conifers are large trees with needles and cones instead of leaves. The cones carry the tree's seeds. How can a small bug find its favorite food on such a large tree? Scientists noticed that when the weather turned cold, these bugs could be found indoors. They wondered if the bugs were attracted to heat. Did conifers make their own heat? Scientists took photographs of the trees with a special infrared camera. These photographs showed scientists the temperature of the trees. The cones were much warmer than the rest of the tree. But how do these bugs know? When scientists examined the bugs, they found tiny heat sensors on their abdomens