In the wild, some of these nests are built

underground using clay or mud.

But you might be most familiar with the paper nests --

the ones built out of saliva and pulp,

typically found attached to buildings or trees.

And these guys can get big.

According to the Guinness Book of World Records,

the largest wasp nest was 12 feet long

and 18 feet all around.

Now, we're all accustomed to avoiding these nests,

because, obviously, wasps are scary,

but today we're going to go inside one,

because there are a lot of fascinating factors

that make these nests work for wasps and their babies.

So, let's cut into one.

Pretty easy to cut through this.

The hardest part was definitely here at the top,

where you can tell the cells are more dense and wider.

If I can give you a scale for how big this is,

I mean, like, look at it next to my head.

This is like a brick cellphone from the '90s.

The key to this type of nest

is the pedicel, or the root.

It's the foundation that the entire nest is built off of.

These are the cells.

Wasps are like butterflies.

They're what's called holometabolous insects,

meaning they go through a metamorphosis

before they become adults,

and these cells are basically their cribs.

Petrovicheva: The cells are open when they

first are produced.

The queen will lay their egg in there,

and then it'll get sealed off.

They're shaped similar to a hollow cylinder,

or like a regular lead school pencil,

and there's a reason why.

Petrovicheva: The walls of the hexagon

hold the other cells.

Also, they're a compact space,

so you can get a lot of these cells

in very, very small space

while still having a very strong structure.

Mills: They're also perfectly sized

to fit both the larva and its roommates.

Petrovicheva: Oftentimes there's some food

laid in with the egg, so when it hatches

it has the food in there already.

The drones move from cell to cell

in a circular motion,

making sure that each larva has food.

Some wasp species tear up insects for the babies,

but other wasps take things further.

Mason wasps drop off whole caterpillars

for their children to eat alive,

while tarantula hawk wasps lay their eggs

on tarantulas they sting and paralyze

as a birthday feast.

Other species lay their eggs inside their prey,

and once the larvae hatch,

they have a meal waiting for them

to chew their way out of.

Petrovicheva: Once the larva is ready to metamorphose,

it'll become a pupa inside the cell still,

and then it'll hatch as an adult.

Mills: Since the cells are both the crib

and the cocoon for these wasp babies,

the nest must maintain a stable temperature

with high humidity.

This means as much insulation as possible.

For these types of nests,

the domes are almost always made of salivary secretions,

plant material, or paper or cardboard.

Petrovicheva: So, they take wood, they chew it up,

and they mix it with saliva to make a glue,

and then they lay it in thin layers.

The denser the layers,

the stronger and more sturdy the structure.

After building the core structure,

the queen wraps the entire nest in an envelope --

these thin sheets of macerated pulp.

This layer basically protects the comb,

or each layer of cells,

limiting the entrance to one tiny little hole.

Scientists think this helps

to maintain the internal temperature

and humidity of the structure.

And more cones can be added on with more pedicels,

sort of like expanding a mansion

with tiny little staircases that the wasps can use

to get from one area to another.

So, now I know the question on some of your minds is,

"Is there honey in a wasp nest?"

And the answer is no.

While both bees and wasps pollinate flowers,

bees actually farm nectar to turn it into honey,

the food source for their larvae.

Most wasps, on the other hand, are meat eaters

and prefer a diet of freshly chewed insects,

meaning you won't find honey in their nests,

but you might find a lot of dead bugs.

So, the next time you see one of these nests

and you're tempted to knock it down,

maybe back off.

Those wasps put a lot of effort

into building this crib for their babies.

We don't want to tick them off.