Feeding, Supplements and Water

The short version

• Uromastyx are herbivores. About 90% of the diet is leafy greens, weeds and edible flowers [1]. LafeberVet gives a lower figure, about 70% greens and grasses [2].
• Add about 5% hard vegetables and about 5% dry seed and lentil mix for adults [1]. No dry food for young babies [4].
• Insects almost never. Their kidneys and liver are not built for much animal protein [7].
• Feed juveniles daily and adults 4–5 days a week. Obesity is the most common diet problem [1].
• Sources disagree on supplements. One care sheet dusts salad with phosphorus-free calcium 2–4 times a week and adds a multivitamin once a week to twice a month, depending on age [7]; ReptiFiles uses calcium and a multivitamin about twice a week [1]. Pick one routine and do not stack extra D3 on top.
• The "no water bowl" rule has exceptions. New, thin, sick and egg-laying animals must be offered water [3].

The daily salad (about 90%)

Make a mix of dark leafy greens and edible weeds, and rotate what you use [1][2][3].

Good staples: collard, mustard, turnip and dandelion greens, endive, escarole, bok choy, spring mix and chicory.

Edible flowers whenever you can get them: dandelion, hibiscus, rose, nasturtium, squash blossoms and clover. Never use florist flowers, which are sprayed.

Chop greens small enough for babies to bite and swallow. Large leaves can choke small hatchlings [4].

Hard vegetables (about 5%)

Finely chopped, shredded or lightly cooked squash, zucchini, carrot, green beans, peas and sweet potato [1][2].

Dry food (about 5%)

A seed and legume mix of white millet, dry or sprouted lentils and split peas, with a sprinkle of quality herbivore pellet (tortoise or iguana pellet, soaked) no more than once or twice a week [1][7].

Sources disagree on how much dry food to allow. Breeders traditionally keep a small bowl of millet and lentils available to adults at all times. ReptiFiles limits seeds to a small amount once a week because they cause obesity [1].

We recommend a middle path: a teaspoon-sized dry dish for adults, refilled when empty rather than topped up daily, and no dry food at all for young hatchlings. One breeder warns that dry food can be fatal to small hatchlings of some species [4].

Insects and fruit

Insects: essentially none. At most, one mealworm or superworm once a week for a growing juvenile and every other week for an adult, or skip them entirely. Breeders sometimes offer a few superworms to thin females after egg-laying [1][3]. Several modern references say to avoid insects altogether [4][7].

Fruit: one small piece once a month at most. The sugar and water content are both wrong for this animal [1].

How often to feed

• Juveniles: daily, as much as they will eat [1].
• Adults: 4–5 days a week, with a lighter day or two to prevent obesity [1].

Offer food in the morning so it is eaten at full basking temperature. Remove wilted greens the same day.

Watching body condition

Obesity is the most common diet problem in captive adults. A healthy uromastyx has a round tail base and a flat belly. In keeper experience, fat pads at the back legs and a belly that drags on the ground mean too much seed and too few greens. ReptiFiles warns that seeds cause obesity when overfed [1].

Supplements

• Calcium: dust a phosphorus-free calcium lightly on the salad 3–4 times a week for animals under a year, and 2–3 times a week for adults [7]. LafeberVet asks for a product with a calcium-to-phosphorus ratio of at least 2:1 and weekly dusting for non-breeding adults [2]. ReptiFiles uses calcium plus a multivitamin twice a week [1]. One care sheet advises calcium without D3 [7]. Some keepers add a calcium with D3 once a week as a safeguard, but this is keeper practice, not proven.
• Multivitamin: a reptile multivitamin once a week for animals under a year and twice a month for adults. Vitamins A and D are fat-soluble and easy to overdose [7].
• All-in-one herbivore powders used twice a week can replace the two-product routine [1].
• Bee pollen is often recommended but often given in unhealthy amounts. ReptiFiles suggests edible flowers for natural pollen, plus a uromastyx grit product used as the label directs [1]. It is optional.

Water: the "no water bowl" rule and its exceptions

The traditional breeder rule is no standing water bowl. The reasoning: these lizards come from places with under 2 in (5 cm) of rain a year, they get most of their water from food, and an evaporating bowl can raise humidity in a small enclosure [2][3]. Healthy, established adults may not need a bowl, and one care sheet says to spritz food with water before feeding [7].

Modern keeper references take the other view: a small, shallow bowl of fresh water should always be available, and it will not raise humidity harmfully in a large, well-ventilated enclosure [1].

We recommend a small, shallow dish on the cool side, cleaned daily, and removed if your hygrometer reads over 35%. Mist the salad lightly rather than the enclosure.

Always offer water to

• New arrivals and any thin animal. Offer a shallow bowl and short soaks in warm water until weight is stable [3]. Keepers commonly use 10–15 minutes in water about 90°F (32°C) and no deeper than the lizard's elbows; the sources do not give a number. Check the water with a thermometer and never leave a soaking lizard alone. Dry the tail afterward, because a lizard left damp after a soak can get tail rot [7].
• Females carrying or just after laying eggs, which in keeper experience drink noticeably more.
• Sick animals, especially anything with runny stool or on medication.
• Any lizard during a heat wave when the cool side climbs past 90°F (32°C).