What Do Iguanas Eat: A Complete Guide to Nutritional Feeding

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TL;DR: Iguanas are strict herbivores whose diet should be 70–80% leafy greens (collard greens, dandelion greens, mustard greens), 20–30% other vegetables (squash, bell peppers, carrots), and only about 5% fruit. Spinach, beets, and foods high in oxalates must be avoided as they bind calcium and contribute to metabolic bone disease — the single most common nutrition-related disease in captive iguanas. Protein sources like insects, meat, or eggs should be avoided entirely, as iguanas lack the kidney function to process animal protein efficiently and it causes fatal organ damage over time.

If you're a new iguana owner or thinking about getting one, you might be wondering, 'What do iguanas eat?' Iguanas are primarily herbivorous, which means their diet should consist mainly of plant-based foods. However, there's a lot more to it than just throwing some leaves in their enclosure. Let's dive into the specifics of what your iguana needs to stay healthy and happy.

Learn How to Keep Your Iguana Healthy by Feeding Them the Best Diet

Proper nutrition is crucial for the health and longevity of your iguana. A well-balanced diet can prevent common health issues like metabolic bone disease and obesity. Here are some key points to consider:

Focus on Leafy Greens

Leafy greens should make up about 70-80% of your iguana's diet. These include kale, collard greens, dandelion greens, mustard greens, and turnip greens. These greens are high in calcium and low in phosphorus, which is perfect for iguanas. Avoid spinach, as it contains oxalates that can bind calcium and prevent its absorption.

Include a Variety of Vegetables

Vegetables should make up about 20-30% of your iguana's diet. Options like carrots, squash, bell peppers, and cucumbers are great. Make sure to wash all vegetables thoroughly and chop them into small, manageable pieces. You can also use a vegetable chopper to make the job easier.

Offer Limited Fruits

Fruits should be given sparingly, about 5% of the diet, as they are high in sugar. Safe fruits include berries, melons, and apples. Always remove seeds and pits, which can be harmful. Feeding your iguana a variety of fruits and vegetables ensures they get a wide range of nutrients.

Avoid Protein-Rich Foods

Iguanas are strict herbivores and should not be fed protein-rich foods like insects or meat. These can cause serious health problems. Stick to plant-based foods to keep your iguana healthy.

What Should I Feed My Iguana?

Daily Feeding Guide

Best Leafy Greens

• Kale: High in calcium and vitamin C.
• Collard Greens: Excellent source of calcium and vitamin A.
• Dandelion Greens: Rich in calcium and antioxidants.
• Mustard Greens: High in vitamins A and C.
• Turnip Greens: Good source of vitamins and minerals.

Best Vegetables

• Carrots: Rich in beta-carotene.
• Squash: Low in oxalates and high in vitamins.
• Bell Peppers: High in vitamin C.
• Cucumbers: Good for hydration.

Safe Fruits

• Berries: High in antioxidants.
• Melons: Hydrating and low in sugar.
• Apples: Sweet and refreshing, but remove seeds.

Can I Feed My Iguana Insects?

The short answer is no. Iguanas are herbivores and should not be fed insects. Feeding them protein-rich foods like insects can lead to severe health issues, including organ damage and metabolic bone disease. Stick to a plant-based diet to ensure your iguana stays healthy.

What Foods Should Iguanas Not Eat?

Foods to Avoid

• Spinach: High in oxalates.
• Broccoli and Cabbage: Can cause goiter.
• Avocado: Toxic to iguanas.
• Onions and Garlic: Irritate the digestive system.
• Processed Foods: No chips, bread, or other human foods.

Why These Foods Are Harmful

Iguanas have specific dietary needs. Foods high in oxalates, like spinach, can bind calcium and prevent its absorption, leading to calcium deficiencies. Goiter can occur from foods high in goitrogens, such as broccoli and cabbage. Avocado is toxic due to its persin content, which can be fatal to iguanas. Processed foods lack the nutrients iguanas need and can cause digestive issues.

How Often Should I Feed My Iguana?

Iguanas should be fed daily. However, the amount you feed can vary based on your iguana's age and size. Young iguanas need more frequent and smaller meals, while adults can handle larger, less frequent meals. Here’s a general feeding schedule:

Always monitor your iguana's weight and overall health to adjust their feeding schedule as needed.

Why Has My Iguana Stopped Eating?

If your iguana has stopped eating, it could be due to several factors:

• Temperature: Iguanas require a specific temperature range to digest their food properly. If the enclosure is too cold, they may stop eating. Learn more about bearded dragon brumation temperature.
• Stress: Changes in environment or routine can cause stress, leading to a loss of appetite.
• Illness: Parasites, infections, or other health issues can cause your iguana to stop eating.
• Dehydration: Make sure your iguana has access to clean water and is properly hydrated.

If you suspect your iguana is ill, consult a veterinarian who specializes in reptiles. Early intervention can save your iguana's life.

What Does a Healthy and Unhealthy Iguana Look Like?

Healthy Iguana

• Eyes: Bright and clear.
• Skin: Smooth and hydrated.
• Weight: Appropriate for their size and age.
• Behavior: Active and alert.

Unhealthy Iguana

• Eyes: Sunken, cloudy, or crusty.
• Skin: Dry, flaky, or discolored.
• Weight: Significant loss or gain.
• Behavior: Lethargic, unresponsive, or hiding.

Regular health checks and a balanced diet can help you catch issues early and ensure your iguana stays in top shape.

Taking Long-Term Care of Your Iguana

Proper Enclosure

Your iguana's enclosure is just as important as their diet. It should be large enough for them to move around freely and include areas for basking and hiding. Use a thermometer and hygrometer to monitor temperature and humidity levels.

Regular Health Checks

Schedule regular health checks with a reptile veterinarian. They can help you identify and address any health issues before they become serious.

Enrichment

Iguanas are intelligent and need mental stimulation. Provide branches, rocks, and other items for climbing and exploring. You can also offer occasional treats to keep their diet interesting.

Hydration

Iguanas need to stay hydrated. Offer a shallow water dish in their enclosure and mist them with water regularly to prevent dehydration.

Additional Resources

If you're looking for more information on iguana care, here are some useful resources:

• Green Iguana Care Sheet
• Iguanas as Pets

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By following these guidelines, you can ensure your iguana stays healthy and thrives in your care. Remember, a well-balanced diet is the foundation of good health for your pet iguana.