Some people have guard dogs for protection. But humans aren't the only ones who pair up with other creatures for safety. Other animals employ tarantulas, worms, and slugs.

Check out these wild security systems:

Eight-Legged Bodyguards

The tarantula creeps on long, velvety legs toward a group of tiny frogs. But rather than scuttling away to avoid becoming the giant spider's dinner, the frogs move in closer.

And the unlikely family settles into its shared burrow.

The Colombian lesserblack tarantula has no problem eating snakes, small possums, and other prey. It often makes meals of frogs, too, but the tiny humming frog is an exception. Scientists think it's because the frogs taste bad to the spiders. Juvenile tarantulas back away once their mouth feelers get close to the frogs, leaving them unharmed.

The frogs are still tasty to snakes and other predators, though, so living with tarantulas seems like a safe bet. The spiders drive away the hungry animals roaming outside the burrow. The tiny amphibians get bodyguards, and in return, they aid the tarantulas by eating the ants that would otherwise feast on the spiders' eggs.

Guard Worms

Snails called limpets live underwater, mostly sticking to rocks and other hard objects. They don't have many defenses for fending off predators. So, like the humming frogs, they rely on partners for protection.

Banded scale worms make themselves at home inside limpets' shells. In exchange for the cozy lodging, the worms fight off starfish and anything else that tries to make a snack of the snail—by biting the attacker with their fangs.

Underwater Uber

Some security teams provide transportation, too. Emperor shrimp are tiny. They're less than 1 inch (about 2 centimeters) from head to tail. Being the little guys in a big ocean can be scary—and exhausting. That's why you'll never see one alone.

Unlike the other animal pairs, which help each other meet their needs, emperor shrimp are all take and no give. They save their energy by riding on the backs of sea cucumbers or sea slugs, using their hosts as boats so they don't have to swim themselves. This saves the shrimp the trouble of hunting, too. They hang out by their rides' mouths and scarf down the stuff that churns up as their host moves about and eats. And if a predator comes along, the emperor shrimp use their hosts as shields, hiding underneath them.

This article is primarily about _________.

how some animals rely on each other for their safety in the wild
why snails are the best bodyguards because they have a hard shell
how some animals are never safe around other animals in the wild
why spiders are the best bodyguards because they have so many legs

how some animals rely on each other for their safety in the wild

Based on the article, which of these is true about lesserblack tarantulas?

They often eat prey like starfish, but they're afraid to get close to snakes.
They often eat snails called limpets, but they don't like banded scale worms.
They often eat prey like small possums, but they don't like humming frogs.
They often eat emperor shrimp, but they're afraid to touch sea slugs.

They often eat prey like small possums, but they don't like humming frogs.

Which passage from the article best supports the idea that lesserblack tarantulas and humming frogs help each other?

The Colombian lesserblack tarantula has no problem eating snakes, small possums, and other prey.
And the unlikely family settles into its shared burrow.
Juvenile tarantulas back away once their mouth feelers get close to the frogs, leaving them unharmed.
The [humming frogs] get bodyguards, and in return, they aid the tarantulas by eating the ants that would otherwise feast on the spiders' eggs.

The [humming frogs] get bodyguards, and in return, they aid the tarantulas by eating the ants that would otherwise feast on the spiders' eggs.

Which is the closest synonym for the word exception?

fragment
oddity
routine
substitute

oddity