Name: 極端な動物の関係 - アースアンプラグド (Extreme Animal Relationships - Earth Unplugged)
Uploaded: 2021-01-14T07:09:24.000Z
Duration: 4 min 24 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

It’s a dog eat dog world…but just sometimes, if you want to get ahead out in the wild,

When different types of creatures interact with one another in the interest of survival,

it’s called a symbiosis, and intentional symbiotic relationships are surprisingly common

Depending on who benefits from the relationship, partnerships can be either mutualistic, commensalistic,

Mutualism is when both creatures benefit from being around each other.

Like at these remarkable underwater fish spas.

Upwelling, nutrient rich waters draw huge numbers and varieties of fish to seamounts

and reefs, but not all of them are here for the food.

Hammerhead sharks, turtles, and even manta rays make their way to these specific locations

for none other than a premium cleaning service.

These big fellas drift calmly around the reef, allowing smaller fish like wrasse, surgeonfish

and angelfish to pick off parasites and algae, leaving them feeling fresh.

The big fish get a luxury exfoliation, and the small fish get a tasty meal, so everyone’s

Of course, there’s always that one friend that asks for just a little too much, and

in this case, it’s the manta ray, who times its visits to coincide with the sturgeon fish’s

spawning season, to get a free meal of fish eggs along with its wax and polish.

Which, frankly, just seems a little bit rude!

On the other hand, if only one creature in the partnership benefits, while the other

is relatively unaffected, it’s called commensalism.

Aphids are tiny insects that feed on plant sap. When they bite into a stem, the sugary

liquid surges out under high pressure, in through their mouths and straight out the

These back-end secretions are called honeydew, and they are a choice delicacy for their symbiotic

Because while the aphids are minding their own aphidy business, ANTS are actively farming

them, and creaming off the delicious honeydew.

Stroking their antennas over the aphids’ bodies encourages a droplet of honeydew to

form, which they can then drink. The ants even move their aphid herds around to more

productive areas of the plant, when supplies start to dry up.

So, delicious drink for the ant, business as usual for the aphid.

Only, it’s not quite as innocuous as it seems.

In order to keep their aphid ‘pets’ at home, the ants resort to more aggressive tactics

that are definitely not business as usual – ripping off the aphids’ wings, and even

drugging them with chemicals from their feet, to make them stay in one place.

And since we’ve strayed into such sinister territory, let’s talk about parasitism,

the most toxic of symbiotic relationships.

In these partnerships, one creature benefits at the expense of another, and while the survival

of the parasite depends on the survival of the host, the freeloaders can often cause

There are loads of parasites, from fleas to tapeworms, and even mistletoe. But by far

the creepiest out there is the Cordyceps fungus.

Cordyceps spores infect insects like this bullet ant, and in true zombie fashion, take

over its brain, making it climb high above the forest floor and clamp onto a twig with

Locked in this rictus grip, the fungus has the perfect anchor, and nutrients from the

insect’s body, to grow its fruiting body.

Once THIS matures, more spores will burst from its tip, and with the wide dispersal

that the high vantage point affords, can infect and decimate entire colonies.

And what’s even more terrifying is that there are thousands of varieties of Cordyceps

fungus, each capable of brainwashing a different insect before consuming it from the inside.

So, there you have it. Amazing symbiotic relationships that might not be so amazing for everyone

True, you can get ahead by working together, but as with so many things in life, it helps

to keep an eye out for yourself as well, or you could end up nothing more than a drugged

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極端な動物の関係 - アースアンプラグド (Extreme Animal Relationships - Earth Unplugged)

straight

aggressive

interact

consume