Everyone is seeing a lot of these around at the moment.
Some years Hong Kong gets more, and sometimes less. Animals are like that...and abundance of prey can often lead to a boom for predators...who then struggle when their food is not so readily available
OK, now for an taxonomic update.....omg, so hard to keep up.....The Auchenorrhyncha (former synonym: Cicadinea) suborder of the Hemiptera contains most of the familiar members of what was called the Homoptera – groups such as PLANTHOPPERS as well as cicadas, leafhoppers, treehoppers, and spittlebugs. This is the funky looking nymph of the planthopper.
The name comes from their remarkable resemblance to leaves and other plants of their environment and from the fact that they often "hop" for quick transportation in a similar way to that of grasshoppers. Well that is pretty obvious..... Planthoppers generally stay very still so as not to attract attention, and then BOING they spring into the air and land some ways away.
They still fall prey to many predators.
They can come in all shapes and sizes....at last count i think we were up to 12,000+ different species in the suborder.