Pick a hamster if you want one pet that’s awake in the evening and can learn to sit in your hand. Pick gerbils if you want a pair you can watch dig and play during the day, and you’re fine with pets that would rather not be held. Gerbils also tend to live longer, about 3 to 4 years against a hamster’s 2 or so.
Matt here. I get this question a lot from parents standing in the pet store aisle, and honestly, the two look so alike in the tank that it’s easy to think they’re the same deal. They’re not. The difference that matters most isn’t the tail. It’s the clock, how many you bring home, and what shape of home they need.
Who’s Awake When You Are
Hamsters are night animals. The RSPCA calls them nocturnal, and says wild ones are mostly active at dusk and through the night, and can run up to five miles a day. Your furry friend will sleep through the school day and wake up right about when the kids are heading to bed.
Turns out that matters more than people think. The RSPCA says a hamster shouldn’t be handled while it’s resting or asleep unless you really have to, because it finds that stressful. So the “let’s get him out and play” moment after school is the wrong moment. Evening is your window. I’d tell the kids that before you buy, not after.
Gerbils keep different hours. The RSPCA describes them as generally out and about during the day, and says wild gerbils are usually active both day and night in summer. So a gerbil tank on the kitchen counter has something going on at breakfast, after school and at dinner.
If you’re a night owl like me, a hamster’s schedule might suit you just fine. If you’re picturing a kid watching their pet on a Saturday morning, that’s gerbil territory.
One Hamster, but Gerbils Come in Twos
Here’s the part that catches families out. You can’t just buy “a gerbil.”
Gerbils are social. In the wild, the RSPCA says, they live in family groups of anywhere from 2 to 15 animals. At home that means a same-sex pair or a small group, and the group has to be put together early in life and stay stable. Two sisters or two brothers who already live together is the easy way to get it right.
A Syrian hamster is the opposite. Wild Syrians live alone in their own burrows, and the RSPCA says Syrian and Chinese hamsters shouldn’t share a home at all. They aren’t naturally sociable, and they’re better off on their own. Some dwarf species, like Roborovskis, can live in groups with the right setup. Even so, if this is your first little buddy, I’d start with one Syrian and skip the roommate.
So the real comparison is one hamster against two gerbils. Two of everything: two mouths to feed, two pets to check on, and two vet bills if something goes wrong.
Same Floor Space, a Different Box
Good news if you’re budgeting. The floor space comes out pretty much the same, which honestly surprised me when I lined the numbers up.
For a hamster, the PDSA points to the German Veterinary Association for Animal Welfare, which sets a minimum of 100 x 50 cm, roughly 39 by 20 inches. The PDSA also wants bedding no less than 25 cm deep, about 10 inches, so your hamster can burrow. And it wants a wheel at least 20 cm across for a dwarf, and 30 cm for a Syrian.
For a pair of gerbils, the UK rescue charity Wood Green gives the same 100 x 50 cm floor, plus 50 cm of height. Three gerbils need 120 cm of length. The RSPCA asks for 20 to 30 cm of bedding and a home about 50 cm tall, so they can dig down and still stand up straight on top. A grown gerbil stands about 12 cm tall.
The difference is the shape. Gerbils are serious diggers, built for desert burrows, and they kick bedding everywhere. That’s why the RSPCA talks about a “gerbilarium”, a tank-style home deep enough to dig in. It even suggests moving gerbils out of a cage if they spend their days digging at one corner. A hamster can live in a cage with a deep base, or in a tank too. Gerbil tunnels need to be at least 5 cm wide, or they’ll get stuck, and the RSPCA says to skip plastic, because they’ll chew it.
Gerbils get a wheel too, but the RSPCA wants a big, solid one, the kind sold for rats, with no axle across the middle. A cheap wheel with rungs is where little feet and legs get trapped.
Where you put the home matters as much as its size. The RSPCA says to keep both pets away from things that give off ultrasound, a sound people can’t hear but small rodents can: TVs, computer screens, vacuum cleaners and running water. So not beside the fish tank filter, and not on the desk next to the gaming PC. A hamster also needs a room where the lights go off at about the same time every night. A teen’s bedroom with the light on till 1 a.m. is a rough fit for a pet that’s trying to keep a schedule.
Holding One: Hamsters Win, Barely
If “my kid wants to hold it” is high on the list, read this part twice.
Gerbils, in the RSPCA’s words, don’t like being picked up and handled, and they may get scared and aggressive if they feel threatened. They’re quick and agile, so even a calm gerbil can shoot off your palm (they’re fast, and they don’t give you a warning). They can get used to gentle handling, but you work up to it slowly. Let them sniff your hand first, then stroke, then scoop.
One gerbil rule to tell every kid in the house: never, ever pick one up by the tail. The RSPCA warns that a gerbil can shed the outer skin and fur of its tail if it’s grabbed there, leaving bone and muscle showing. It’s how a gerbil escapes a predator, and it’s awful to see.
A tame hamster usually sits better in your hands. You still let it sniff first, and you hold it just a few inches over a table, because a fall from a height can hurt it. Wake it up to play and you might get nipped, which is fair, honestly. I’d be grumpy too.
Want to get a hamster used to you? My hamster taming guide goes step by step.
The Smell Test
Gerbils have a small edge here, and it comes from the desert. I kinda love this one. The RSPCA says they’re adapted to dry climates and make relatively small amounts of urine to hold on to water. Less pee usually means a home that stays fresher for longer.
That doesn’t mean zero cleaning. For both, the RSPCA says to spot-clean every few days, picking out poop, wet bedding and old food. The deep clean comes every two to three weeks for gerbils, and once or twice a month for a hamster, depending on the cage size and whether your hamster picks one corner as its bathroom.
Here’s a tip that surprised me when I first read it. Don’t scrub the home to hospital-clean. Both animals live by their noses, and the RSPCA says to keep a little old, unsoiled bedding and put it back after a clean. For gerbils it’s more than comfort, since stripping every familiar smell can start a fight between cage mates.
How Long Each One Lives
This one’s hard to talk about with kids (I know), but I think it should be part of the choice.
The RSPCA says hamsters usually live up to about two years, and some go a bit longer. Gerbils can live three to four years, and some longer still. That’s nearly double, which matters if your child is the kind who gets very attached.
It also changes the cost. A pair of gerbils for three or four years is a longer run of bedding, food and chew toy refills than a single hamster for two. Not a huge bill either way, but worth knowing. If you want the long version on hamster ages, I wrote up whether hamsters really live for 2 years.
And whichever you pick, find a vet who sees small pets before you need one. If your furball stops eating, gets wet tail or is breathing hard, that’s a call to the vet that day, not a wait-and-see.
Which One Fits Your Home
Here’s where I land. For a family with younger kids who mostly want to watch, gerbils are the better first pet, as long as you buy two and a deep tank. For an older kid or an adult who wants one pet to tame and hold in the evening, a Syrian hamster is hard to beat.
What I wouldn’t do is let the pet store decide for me. A lot of the starter cages sold for hamsters are too small, and a gerbil in a wire cage with an inch of bedding is a gerbil that’ll spend all day trying to dig through the corner. Plan the home first, then pick the animal that fits it.
If a hamster’s winning, my notes on a hamster cage for a kid’s room and how deep hamster bedding should be will save you a second trip to the store. And if you’re wondering whether the two could ever share a tank, I answered whether hamsters can breed with gerbils too. Short version: keep them apart. Still weighing a bigger pet? Here’s the hamster vs the guinea pig, side by side.