Can I house adult and juvenile crested geckos together? How to sex them?

I commend you for rescuing those Leos! Female leopard geckos may live together peacefully as long as they have a large enough enclosure. Males should not be housed together as they will fight. If you have a male and female, they should be separated until the female is at least 55 grams, which is the minimum weight recommended for breeding. I would guess they may be about 3-5 months old. Hatchlings typically weigh 2-5 grams for reference. There is no "standard" since leos will grow at different rates depending on dietary and environmental factors. You can determine sex by looking underneath. Males have noticeably distinct femoral pores and pre-anal pores. The base of their tail will have two hemipenal bumps as well. You can review leopard gecko care here: http://www.anapsid.org/leopardgek.html

Ideally, a female crested gecko should be in the 35-40 gram weight range and at least 18 months old. If she's never been with a male, the eggs will be infertile. If she was previously mated, it is possible she may have retained sperm. Female cresties can retain sperm for 6 months or longer. A gravid female will typically lay just two eggs every month during breeding season. Egg binding can be characterized by. A swollen abdomen, lethargy, loss of appetite and frequent straining to lay. This condition should be addressed immediately by your veterinarian or an experienced herp vet. You can read more about breeding and egg care here: http://www.reptilesmagazine.com/How-to-Breed-Crested-Geckos/

Two female geckos cam live together peacefully as long as the enclosure is of sufficient size. Two males should never be housed together. Gender cannot be determined by the images posted. Males can be differentiated from females by the presence of a V shaped line of pre anal pores just in front of the vent and hemipenal bulges behind it. Your gecko appears to be in the middle of a shed. This is a stressful time for geckos. Provide one or two moist hides in the cage and daily soaks to aid in shedding. Feed appropriately sized prey, no bigger than the space between the eyes, that have been gut loaded for 24 hours prior to offering to maximize nutritional value. Calcium w/D3 and Vitamin supplementation is essential to good health. Consider an exam with your veterinarian or an experienced herp vet to diagnose illness or injury. Submit a stool sample to diagnose intestinal parasites.

Hello, here is a link to care sheet for crested geckos. I suggest you read it carefully and make sure you are doing everything correct with regards to husbandry. I think this will answer most of your questions but if not, feel free to post again. ( http://www.reptilesmagazine.com/Care-Sheets/Lizards/Crested-Gecko/ ) You cannot tell their age unless you know when they were born. Short of that all you can do is guess based on size.

An adult crested gecko should be housed in a 20-gallon tank with screen top. Larger tanks will allow for better displays. In areas with moderate to high relative humidity, crested geckos will fare well in screen cages.

Crestview can eat crickets, but feeding solely crickets is not a healthy or balanced diet. At most, feed 5-7 appropriately sized crickets twice a week. The majority of the diet should be a crested gecko diet, such as one from Pangea or Repashy. If she doesn't get stressed being moved, you can feed her in a separate container if that is easier for you.

If he isn't struggling or trying to escape, he's probably okay with being held. Don't hold him for too long initially. Gradually increase the handling time to acclimate him. Even though he doesn't struggle, it may still be stressful, so he'll return to a safe place when returned to the enclosure. As he adjusts to his new surroundings, he may begin to explore. A "best guess" on age would be 12 to 16 weeks. Reptiles have different growth rates depending on diet, availability of food and environmental factors.