Why Care Sheets Aren’t Enough

Before anyone sharpens their pitchforks - there is absolutely nothing wrong with care sheets.

In fact, I love them.

They contain practical, useful and often very accurate information on an extraordinary range of species and over the years I’ve written more than 260 of them myself, covering everything from Asian giant mantids to Yemen chameleons and a fair amount in between.

Every species I’ve been lucky enough to work with got a care sheet.

Inside those wonderfully neat little documents was everything you could reasonably need to get started; temperature ranges, humidity targets, dietary requirements, notes on natural history, water provision, UV recommendations and Ferguson zones.

On paper—

everything was there.

And for a long time, I thought that was enough.

• Build enclosure.
• Match parameters.
• Provide food.
• Observe textbook behaviour.

Job done.

Except - it turns out the animals never got the memo.

Because somewhere between writing hundreds of care sheets and actually living with the animals themselves, I realised something uncomfortable.

Care sheets are excellent at describing species.

They are considerably less good at describing individuals.

And that changed the way I think about husbandry entirely.

So—

let’s find out why.

Care sheets are excellent starting points for any and every species you can think of. They provide the broad strokes and everything you need to begin; temperature ranges, humidity targets, feeding recommendations, enclosure dimensions and environmental requirements. They give an overall average for all parameters.

But the problem with averages is they’re very… average.

Perfect middle ground. The Switzerland of numbers. Bang in the middle of too much and not enough. Individual animals do not work on averages because individuals are, by definition, unique.

For example—

the recommended maximum caffeine intake for an adult is around 400mg per day. My own intake on some days almost doubles that at roughly 750mg with no obvious ill effects (as I write this, twitching slightly).

Out of context that sounds terrible and suggests I have the life expectancy of a mildly depressed lemming.

Add context though—

I’m a large bloke. Six foot two, 120kg, retired rugby player and former chef. My tolerance, metabolism and body mass mean that amount affects me very differently to my dear Penny, who possesses considerably fewer kilograms with which to absorb poor decisions.

Same recommendation.

Different individual.

And reptiles are no different.

A care sheet might tell me that a species prefers a basking temperature of 40°C, moderate humidity and low climbing opportunities.

But that doesn’t mean every individual will use that environment in the same way.

One royal python may spend every available second hidden. Another may climb every branch it can physically reach.

One leopard gecko may bask openly. Another may choose cover and emerge only at dawn.

One bearded dragon may flatten itself under UV. Another may avoid direct exposure and use reflected light instead.

The care sheet isn’t wrong.

It describes the average animal.

But we don’t keep averages.

We keep individuals.

That’s where observation starts becoming more important than replication.

The enclosure doesn’t stop at “correct”.

It starts there.

Look at Agnes (and I actively encourage you to read Agnes’ story).

I set everything up exactly by the book. Temperatures were correct, lighting was correct, humidity was correct and from a husbandry perspective everything looked exactly as it should.

Then I let Agnes tell me what I’d done wrong.

That sounds ridiculous until you spend enough time keeping animals and realise observation matters just as much as preparation. Agnes showed me what she used, what she ignored and where my assumptions didn’t line up with reality. I adjusted and she responded.

That led me to one of the simplest equations I work by now—

create for the average and adjust for the individual.

Another example of this came in the form of Bruce and Betty.

Bruce and Betty are bull snakes (Pituophis catenifer sayi), large North American colubrids capable of reaching over seven feet and carrying themselves with all the confidence of an animal that knows exactly what it thinks. When they arrived with us as rescues, I did exactly what I always recommend people do. I researched. I compared sources. I looked through multiple care sheets and eventually wrote my own based on that information.

In other words—

I averaged the averages.

Bull snakes are broadly recommended to have basking temperatures of around 29–32°C so that is exactly what they received. Everything looked right on paper.

Bruce and Betty disagreed.

Now, I should explain the names.

Bruce Banner becomes the Hulk and Betty Ross becomes the Red She-Hulk. Both have fairly spectacular anger management issues, and it turned out the snakes lived up to their names rather well.

• Striking.
• Hissing.
• Tail buzzing.
• General outrage directed at the universe.

At one point one of them stole my phone. That story can wait for another day.

So instead of continuing to adjust things based on what I thought should work, I started watching them. I changed temperatures, adjusted gradients and paid attention to where they spent time and how they behaved.

Eventually I found both snakes consistently preferred cooler basking temperatures than expected.

Bruce settled at around 26°C.

Betty preferred closer to 28°C.

The difference was immediate. They became calmer, less reactive, fed more consistently and moved around the enclosure with far less urgency.

The care sheets weren’t wrong.

Those temperatures probably work brilliantly for many bull snakes.

But Bruce and Betty weren’t many bull snakes.

They were Bruce and Betty.

And they had opinions.

Care sheets were never the problem, and I don’t think they ever will be.

They remain one of the best tools we have for understanding species requirements and creating environments that allow our animals to succeed. They give us somewhere to start, provide context and help us avoid making avoidable mistakes.

But they are starting points, not destinations.

Because once the enclosure is built and the animal moves in, something changes. The averages stop mattering quite so much and the individual in front of you starts giving feedback. Some will follow expectations almost perfectly. Others will quietly ignore everything you thought you knew and show you another way.

That’s where the real work begins.

Watching.

Adjusting.

Learning.

Care sheets tell me how to keep a species alive.

Observation teaches me how to help an individual thrive.