There are too many stick insect species to identify. In fact, there are over 3,000 to be more accurate. Most of the species are around the tropics though (Wikipedia).
Lord Howe Island Stick Insect
It is impossible to say how many individual stick insects are in the world - but there could easily be many millions. As for species, there are at least 3,000 different species of stick insect that...
Indian laboratory stick insects lay up to 200 eggs. They do not need any surface to lay them on they will just drop them. They take up to 3 months to hatch. It is very likely that some will have to...