Tigers, the big ones, once ranged widely across eastern Eurasia, from the Black Sea to the Indian Ocean and from Kolyma to Sumatra. However, over the past 100 years, they've lost 93 percent of their historic range, and have been extirpated from western and eastern Asia.
They range today from the Siberian taiga to open grasslands and tropical mangrove swamps. Major reasons for population decline include habitat destruction and fragmentation, and trophy-hunting by poachers. As a result, the remaining six tiger subspecies have been classified as endangered by the International Union for Conservation of Nature.
With apologies to my good pal, great
Tiger beetles and tigers are similar in
Be that as it may, while tigers are mammals, born into the world just like you and me, a tiger beetle begins life as an external egg, hatches into a larva, then proceeds to a pupa, then, after the miracle of metamorphosis, emerges as an adult.
- Zleng | Flickr
- Metallic tiger beetle shot in Selangor, Malaysia
In the very early stage of life, mammals live and grow in a placenta—utilizing the nutrients in the mother's blood. The tiger beetle, on the other hand, grows and develops while it's in the larval stage, and even then, it's a supreme killer of other, smaller invertebrates.
They display an uncommon method of pursuing their prey, in that they alternatively dash quickly toward their victim, then stop, then dash after it again. This may be because while making those sudden sprints, the beetle's moving too fast for its visual system to accurately process in real time. Maybe it's like me as I get older, having to stop and say to myself, "Now, where was I headed...?"
Tiger beetles have another trait that may also be associated with their speedy, sprint-stop-sprint-stop method of pursuit. To avoid running into things, they hold their long, rigid antennae directly in front of them to mechanically sense what's coming, head-on.
In 1996, scientists in the Netherlands tested two species of Australian tiger beetle, (
Tiger beetles have large bulging eyes, which gives them
Tiger beetles, worldwide, are hot-to-trot predators, both as adults and as larvae. While most species are diurnal (day-moving), four genera are nocturnal, and most tiger beetles are brightly colored, while a few genera found living primarily in the dry regions of southern Africa are all black.
- Muhammad Mahdi Karim
- Lophyra sp. Tiger beetle pictured in Kibaha, Tanzania.
While there are many instances of adult tiger beetles glomming onto human appendages, there are no records of the larvae of tiger beetles attacking humans. The larvae live in cylindrical burrows as much as 3 feet
In researching these colorful, predatory beetles I discovered they are also—like tigers of Asia—considered a good indicator species, and have been used in ecological studies on biodiversity health. That is, if they are found in their normal numbers in
As an example, several species of wingless parasitic wasps lay their eggs on larvae of various tiger beetles, which would indicate the ecosystem is operating well. In the same
The next time you head for North Bend or Coos Bay for a day on the beach, take a look in the sand dunes among the grasses and other vegetation and you'll (hopefully) meet up with Oregon's tiger beetles. If you don't, please call me and we'll find out why. And if you go tiger-viewing, please be careful, and hurry home; I'd love to see your pictures!