See them at Brides Pool Road, or at Hong Kong Wetland Park. This large insect flies slowly, often quite low to the ground and has two pairs of butterfly-like wings, but a body like a dragonfly. And yes, it is a dragonfly called the "Variegated Flutterer", and each individual has unique patterning on its wings.
Insects are a class of invertebrates that have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of jointed legs, compound eyes and one pair of antennae. The word "insect" comes from the Latin word insectum, meaning "with a notched or divided body".
Insects are incredibly diverse, with the number of extant species estimated at between six and ten million.
They represent a staggering 90% of the differing animal life forms on Earth.