10
Insects You’ll Never See Coming (Until Its Too Late)
By Christopher Stephens, Toptenz, 30 May 2015.
By Christopher Stephens, Toptenz, 30 May 2015.
Venomous insects have been copied by
a range of “imposters,” which may be other insects, non-insect species or even
plants. Motives include avoidance of predators, a bizarre pollination scam or an
attempt to infiltrate gatherings of a prey species. Whatever the logic, “be
yourself” is the antithesis of survival for these life forms.
10. The Bird that Looks like a
Caterpillar
For a venomous insect to be
effectively mimicked by another insect is plausible. But in the case of the
creatively named orange caterpillar, the imposter is a bird. Native to Peruvian
rainforests, the cinereous mourner is a tropical songbird which raises its
chicks in open nests and frequently leaves them alone in a warm, food rich but
otherwise hostile environment filled with experienced nest predators.
The grey birds begin their life as
bizarre nestlings covered in bright, obvious orange feathers with special
quill-like protrusions. These protrusions are effective in helping match the
appearance of a toxic caterpillar which happens to be almost identical in size to a cinereous mourner
chick. And if that weren’t enough, the
young birds have an elongated body shape and creep around the nest in an
exaggerated caterpillar like motion. Any predator looking at the nest sees a
writhing, toxin laden bug that could be their last meal, rather than a vulnerable and tasty
young bird.
9. Insect Mimicking
Orchids
The ability of a plant to take on the appearance of an animal is a rare switch in a world where animals tend to mimic plants to
blend in. In order to pass on their pollen, one flower mimic the females of certain wasp and bee species, which draw males looking to mate. These careless suitors mount the flowers, but instead get a load of pollen with which they will struggle
before being scammed again and depositing the pollen on another flower. The
flower is then pollinated, but there’s no contribution to the male’s
reproductive success in the process.
8. Robber
Fly
Insects and animals mimic venomous
insects in order to look more intimidating, but in a more ingenious and
aggressive twist, this mainstay of defensive mimicry has been turned around as a
form of aggressive mimicry by the Florida Bee Killer Mallophora
bomboide. Coloured to match their
specific prey species rather than to appear venomous, these robber flies
infiltrate areas where bees gather and seize single, unsuspecting bees in
lightning fast surprise attacks.
Their black and yellow hairs,
together with the beelike hum produced in flight, allow them to get close enough
to strike without being recognized. Among the largest and strongest flies,
Mallophora kill with powerful legs that simply crush the bee against the
enormous fly’s body. Discarded exoskeletons of the bees may be
found near a robber fly’s hunting grounds.
Beekeepers have reported losses to their activity, but normally no serious
problems result from the fly’s presence.
7. Wasp Mimicking Longhorn
Beetle
Wasps are the more formidable
counterpart to bees, thanks to their ability to sting enemies repeatedly in
defense. Wasps also capture live prey, in some cases using their stinger to
assist in subduing the victim. It makes sense that wasps might become the
subject of mimicry, including by a beetle. Native to England, Wales and parts of
Scotland, the wasp beetle is a longhorn beetle that has developed both the
colouring and the shape of a
typical wasp. This animal is a completely harmless insect that makes its home in
decaying woody material and bark.
Slow moving and likely quite
palatable, the beetle would be a prime target for birds were it not for the
misdirecting wasp markings that discourage attacks. Not only marked like a wasp,
the wasp beetle has also taken on the specific movements of a wasp to complete the full mimicry of its venomous model species. The
long horns and hard carapace distinguish the animal, but even humans could be
fooled at first glance.
6. Aggressive Ant
Mimicry
Imitating a formic acid bearing ant is a good
strategy to encourage predators to leave an animal alone, but certain spiders
from North America have more sinister intentions. In contrast to defensive
mimics, aggressive ant
mimicking spiders resemble ants and
infiltrate groups of these dangerous prey animals before seizing one and
injecting it with venom.
Being seen with a dead body of an ant
might be a giveaway that the vulnerable spider is an ant killer, but a creepy
trick allows the spider a chance to avoid attacks. Holding up the body of the
prey, an ant mimicking spider uses the body as a shield against defending ants.
Stranger yet, the spider may actually convince the other ants that it’s a member
of the group carrying a dead nest mate away, as ants sometimes do. The lines
between aggressive mimicry and defensive mimicry may sometimes be blurred, according to leading research
into the behaviour of these rather aberrant but marvellously adapted
spiders.
5. The Marvellous Mimicry of
Moths
Moths are the first to come to mind
when truly defenseless insects are mentioned. Select moths have therefore come
to mimic bees and wasps, among the most dangerous of insects, in order to gain
protection under false pretenses. Except for their bright blue antenna,
clearwing moths of North America appear to be extra-large and intimidating wasps. The slender
appearance of these insects, combined with black and yellow body patterns and
clear wings, bring the entire effect together to confuse even humans.
In contrast, the Orange Wasp Moth of
open Australian habitats is large, with a broad wingspan and hefty body. The
colours on this creature are even more vibrant, giving enough of an impression
of risk to avert the attentions of even the most persistent predator. These
moths are less likely to fool humans due to their distinctive moth shape,
but predators are likely to fail to recognize the defensive mimicry.
4. Wasp
Mantidfly
Few insects seem as far apart as a
wasp, a lacewing and a praying mantis. However, the potential of convergent
evolution to produce astounding examples of mimicry is strong. Found in certain
North American habitats, the wasp mantid Climaciella brunnea is a
lacewing with base brown colours but accented by bright yellow bands that make
it look like a lanky wasp with praying mantis-like forearms.
In a bizarre parasitic relationship,
the adult animal approaches wasp colonies and lays eggs that soon hatch into
larvae that grab onto adult wasps in order to be distributed. This parasitic
behaviour isn’t particularly harmful, but it does add a weight burden to the
flying wasps. This strange lacewing also has exceptional
adaptations to aid it in hunting. With
hooked front arms, the wasp mantid can capture other insects praying mantis
fashion and make short work of such victims.
3. The Australian Spider that
Mimics Golden Ants
Spiders may seem
intimidating, but ants may be seen to pose a
greater threat. This is evidenced by a small yellow spider
from the Eucalyptus forests of Australia that exhibits subtle but distinctive
evolutionary changes that transform it into what any reasonable person would
recognize as an ant. The Myrmarachne jumping spiders engage in defensive
mimicry, but come equipped with acidic venom that may be used on potential
predators as well.
The spider not only resembles an ant,
but walks in an antlike fashion and takes the mimicry one step further by waving
its antenna. The creatures often associate loosely with real ants to add to the
effectiveness of their disguise. While ants are unpalatable enough to warrant
mimicry, a strange additional fact to consider is that certain predators can
handle ants and may deliberately target them. Ant mimicking spider species have
been known to “turn off” their mimicking behaviours and reveal themselves to be a spider in order to avert an attack
by predators that would certainly prefer to tackle an ant rather than a
spider.
2. Hoverfly Mimicry of Vespids
and Bees
With a nearly worldwide distribution,
hoverflies of many species take on the appearance of both wasps or bees to
ward off the attention of predators. Adult hoverflies feed on nectar and pollen, while the young of
certain species may add insect prey to their already mixed diet.
The hummingbirds of the bird world,
hoverflies are already well defended against many predators thanks to their
exceptional aerial agility and wing blurring
flight. But that’s apparently not enough, and
the hoverflies have adapted to look completely unpalatable and toxic
to prevent an attack by a predator. There are downsides - some scientists have
suggested that looking like a wasp may make a hoverfly more subject to persecution by humans.
1. The Scarab Beetle that
Passes for a Bee
While beetles seemingly couldn’t be
more different from bees, a fascinating scarab beetle native to North
America matches the colours and even the
shape of a bee. Right down to the position of the wings, this incredible
arthropod has yellow fuzz on its abdomen that completes the perfect impression
made by this highly evolved, defensive imposter.
The brightly coloured flower scarab
beetle Trichiotinus affinis appears as if it were a resident of dry
land. Closely related to June bugs and other familiar beetles, this species is
in fact found on purple iris stalks in wetlands. The harmless insect could be
swiftly captured by blackbirds, predatory insects and other hunters, but the
appearance of the insect is such a dead ringer for a bee that no predator is
likely to tangle with it.
Top image: The baby bird
(cinereous mourner) that looks and behaves like a caterpillar. Credit: Slate Video via
YouTube.
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