Why Do Hens Eat Their Eggs, and How Do You Stop It?

There are few things more annoying than walking up to the nesting box, lifting the lid with normal expectation of eggs, and finding a beautifully laid egg with a hole pecked into the side.

You've fed them, housed them, and nurtured them only to discover that one of them has decided breakfast is served before you even arrive.

After 13 years working with backyard chicken keepers, I can tell you this is one of the regular calls that we get. The good news is that egg-eating is almost always understandable. The less good news is that once a hen learns the habit, she can be stubborn about giving it - like me and cheeseburgers!

How It Usually Starts

Egg-eating rarely begins on purpose. Most of the time, it starts by accident. A hen lays a thin-shelled egg, an egg gets dropped onto hard flooring, or a floor egg gets stepped on in the run. One curious peck becomes a snack. The hen files it away, and a few days later, she's back for another.

Sometimes the rest of the flock joins in. Chooks are excellent at noticing when another chook has found something interesting, and they're not great at keeping it to themselves.

One of our customers described it perfectly. One of her girls had "just started to peck holes in the eggs each day." She was collecting eggs in the morning, then collecting again later because one hen laid later than the others. She'd seen the culprit in action. That's how most cases begin. One hen, one weak point, one repeated opportunity.

Start With the Shell

The first place I look is shell strength. Older hens, particularly from around 18 months onwards, often lay larger eggs with thinner shells. The same amount of calcium has to stretch across a bigger surface, so the shell ends up more fragile.

If that egg lands in a thinly bedded nest, on compacted material, in a dirty nesting area, or on the floor, it can crack. Once the contents are visible, hens become curious very quickly.

I've found that shell quality is the single biggest factor in most backyard egg-eating cases. Get the shells stronger, and the problem often fades on its own.

Worms

Parasitic roundworms that build up in number can cause soft-shelled eggs, which are then easily broken. It's one of the first things that I ask customers about when they call about their young hens laying soft-shelled eggs.

Fortunately, it's a quick fix, and I always recommend a broad-spectrum dewormer such as our Worm All to knock down the intestinal parasite population and restore the egg shell strength. Worm All is a feed-based dewormer, unlike most chicken dewormers, as it's always difficult to get hens to drink medicated water.

Nutrition Does More Than People Realise

Laying hens need a balanced layer diet like Sustainable Layer. Not just grain, not just kitchen scraps, not whatever looks wholesome from a human point of view.

Treats are fine in moderation, but too many of them dilute the calcium, protein, vitamins and minerals your hens need. Shell grit should be available free-choice for older hens, in a separate container, so each hen can take what she needs. This is also important for hens being fed a lot of scraps or a wide range of food sources.

Fresh water matters too. Dehydration and heat stress affect laying and shell quality more than people expect, particularly through a hot Australian summer.

The Nest Itself

Hens like nesting areas that feel private, dim, calm and secure. Bright, exposed or overcrowded nest boxes push hens to lay elsewhere, often on the floor where eggs get stepped on, dirtied, or discovered by the flock.

A recent review on floor eggs found the issue is multifactorial. Nest use, bird training, housing design, genetics and management all play a part. For us backyard chicken keepers, that just means there's rarely one magic fix. The whole laying environment matters.

A few practical things that help:

• Keep nesting boxes clean, dry and well cushioned with 10 to 15cm of nesting material. A soft, absorbent and hygienic material, such as hemp fibre, is far better at reducing the risk of eggs breaking than straw.
• Provide enough nesting space. One nest for every four to five hens is my rule of thumb, though backyard hens will still argue over the "best" box like shoppers at a Boxing Day sale.
• Keep the nests darker than the rest of the coop. If needed, add a nest curtain or reposition the box so it feels more sheltered and secluded.

Collect Often While You're Breaking the Habit

While you're working through the issue, collect eggs early and often. If you've got a hen who lays late, a second collection in the afternoon is worth the trip.

Remove any broken egg straight away. That means the shell fragments, the wet bedding, and the smell. Hens have sharp eyes and a sharper sense for opportunity.

Tools That Help

Wooden eggs are useful in two ways. They encourage hens to lay in the right spot, and they can discourage pecking because the hen gets nothing for her trouble. A few disappointing pecks at a wooden egg take the fun out of the game pretty quickly.

For chronic cases, roll-away nest boxes are a strong option. The egg disappears from the hen's reach as soon as it's laid, which removes the reward entirely.

You'll sometimes hear about old remedies, like filling a blown-out egg with mustard or something unpleasant. They can occasionally work, but they're not where I start. Chilli in particular is unreliable, because birds don't respond to capsaicin the way mammals do. They'll happily eat the lot. It's better to remove the cause than try to get the hen out of the habit once formed.

If You Know the Culprit

If you've spotted exactly which hen is doing it, watch her for a few days. Is she laying thin-shelled eggs herself? Is she hanging around the nest after the others have finished? Is she bored, broody, or sleeping in the nesting box and breaking eggs overnight?

Each of those points to a different fix. Blocking nest access at night (one of my Golden Rules), improving the perches, adding a bit of enrichment, and collecting promptly will all help, depending on what's going on.

The Bigger Picture

In most backyard flocks, egg-eating can be sorted out if you act early. Strengthen the shells, improve the nests, collect more often, use a dummy egg or two, and remove every trace of broken egg ASAP.

The aim isn't to punish the hen. It's to stop her from being rewarded for the behaviour.

Because once a hen learns that eggs are delicious, she doesn't need a written invitation to keep going.

Frequently Asked Questions

Will egg-eating spread to the rest of the flock?

It can, and that's why acting early matters. Chooks are observant, and once one hen finds something interesting, the others tend to investigate. I've seen single-hen cases turn into flock-wide habits within a week or two. The fix is the same either way. Strengthen the shells, tidy the nests, and remove every trace of broken egg before the rest of the girls catch on.

How do I know which hen is eating the eggs?

The simplest way is to sit quietly near the coop in the morning and watch. The culprit usually gives herself away. Look for yolk on her beak, breast feathers, or face, particularly just after laying time. If you can't catch her in the act, check which hen spends the most time hanging around the nest after the others have laid and left.

Should I cull a hen that eats eggs?

Almost never, in my experience. Egg-eating is a learned behaviour, not a personality flaw, and most cases can be fixed with better nest management, stronger shells, and prompt collection. Try the practical fixes first. They work in the great majority of cases.

Does giving hens calcium stop egg-eating?

It can certainly help, because thin shells are one of the most common causes. Make sure free-choice shell grit of larger particle size is available in a separate container so each hen takes what she needs, particularly older hens. That said, calcium alone won't fix a case that's already become a habit, or a build-up of roundworm.

Are roll-away nest boxes worth it?

For chronic cases, yes. Roll-away nests work because the egg disappears from reach as soon as it's laid, which removes the reward entirely. They're not the cheapest option, but for a flock that's been at it for a while, they often pay for themselves in saved eggs and saved frustration. For a one-off case, simpler fixes usually do the job first.

Why do chickens eat their eggs but not the dummy ones?

Because dummy eggs don't crack, are normally too large, and don't reward the behaviour. A wooden egg looks right, sits where the real egg should sit, and gives the hen nothing for her trouble. A few disappointing pecks and most hens lose interest. They're cheap, low effort, and one of the first things I recommend trying.

Can chickens eat eggshells safely?

Yes, and some keen chook keepers feed crushed eggshells back to their flock as a calcium supplement. The trick is to crush them well so they don't look like eggs anymore and bake them in the oven to kill any bacteria. If you leave shells looking shell-shaped, you can accidentally teach the flock that eggs are food.