Why Do Some Reptiles Carry Mites?
These fascinating creatures come with a few potential challenges, and one of the most persistent is dealing with mites. It’s 2026, and reptile keepers are still battling these tiny parasites. Why do some reptiles seem to attract mites while others remain unaffected? This guide dives deep into the world of reptile mites, exploring the reasons behind infestations and offering you practical solutions to keep your scaled companions healthy and mite-free. Whether you’re a seasoned herpetoculturist or a first-time keeper, understanding the factors that contribute to mite infestations is crucial for maintaining a thriving (and parasite free!) reptile collection. The Biological Foundations of Reptile Mite Parasitism The world of mites that can affect your reptiles is incredibly diverse. Over 400 species of ectoparasitic mites and ticks specifically target reptiles worldwide [4]. These tiny creatures belong to different orders and families, each with its own unique adaptations for parasitizing reptiles. ectoparasite: a parasite that lives on the exterior of its host One of the most common and troublesome species in captive reptile collections is Ophionyssus natricis, or the snake mite [9][10]. This pest has spread globally through the reptile trade and can even be found in wild populations in places like Australia [32]. Other common culprits include the lizard mite (Hirstiella trombidiiformis), known for its reddish color and preference for lizards, and chigger mites (Trombiculidae), whose larval stages are parasitic [10][33]. For those of you who live in the Southern United States, you’ve almost definitely encountered a chigger mite yourself, and know how annoying they can be! A 2014 study of Moroccan lizards revealed that 22.4% of the lizard population was infested with mites [4]. Trombiculid mites were the most prevalent, affecting 17.2% of the lizards, followed by Pterygosomatidae (4.1%), Ixodidae ticks (1.5%), and Macronyssidae mites (0.4%) [4]. These kinds of studies help you to understand the variety of mites that can affect reptiles, depending on their environment. The Evolutionary Perspective: Host-Parasite Coevolution and Specificity But why do certain mites target reptiles while others prefer mammals or birds? The answer lies in coevolution and host specificity. Mites and reptiles have evolved together over millions of years, with parasites adapting to specific hosts. Research has shown that mite morphology can even be influenced by the host, suggesting a close relationship between the two [11]. coevolution: evolution involving successive changes in two or more ecologically interdependent species (as of a plant and its pollinators) that affect their interactions Parasites evolve in response to their hosts’ defenses, leading to increased specialization. Snake mites, for example, have developed thermal preferences almost identical to those of their reptile hosts, thriving at 75-85 degrees Fahrenheit with 70-90% humidity [10]. This remarkable adaptation demonstrates the power of coevolution, and the reasons that certain species of reptiles are more prone to mites, but also why certain mites only infest specific species. Environmental and Husbandry Factors Contributing to Mite Infestations Mite infestations are often more severe in captivity than in the wild. Wild reptiles have natural behaviors and physiological mechanisms for managing parasite loads, such as shedding their skin (ecdysis) to remove external parasites [12][36]. Even though reptiles in captivity still shed, they aren’t able to leave it in a completely separate location and then move on, they’re stuck in a closed environment with their shed! In the wild, they’re also able to disperse across the landscape, reducing the concentration of parasites that they’re exposed to for extended periods of time [9]. In contrast, captive environments provide ideal conditions for mite reproduction. Stable temperatures, appropriate humidity, and confined spaces create a perfect microhabitat for mites to thrive [47]. Female snake mites can even reproduce asexually/parthenogenically, meaning a single mite can start an entire infestation [38]. This, combined with the favorable conditions of captivity, allows mite populations to explode within weeks. Climate as a Primary Driver of Mite Distribution and Prevalence Climate plays a significant role in mite prevalence. A study of museum specimens from Israel and the Palestinian territories found that mite prevalence decreased 3.9-fold from Mediterranean climate zones to desert-edge regions [31]. Mediterranean areas, with higher humidity and moderate temperatures, had a mite prevalence of 4.3%, while desert-edge environments had only 1.1% [31]. This difference is due to the physiological constraints of mites. Mite eggs and larvae are highly susceptible to desiccation, with high mortality rates at humidity levels below 75% [32]. The stable, warm, and humid conditions typically maintained in reptile enclosures inadvertently create an ideal environment for mite reproduction. desiccation: the state of becoming “dried up” Stress, Immune Suppression, and Disease Susceptibility Stress and immune suppression can also contribute to mite infestations. Reptiles have immune systems that can be weakened by improper environmental conditions, inadequate space, poor nutrition, and/or the stress of captivity itself [2]. In healthy reptiles, parasites like pinworms and coccidia may exist as relatively harmless cohabitants [2]. However, stress-induced immunosuppression can disrupt this balance, leading to parasitic diseases [2]. Similarly, poor husbandry practices create conditions that allow mite populations to thrive. How do you get mites? The most common way mites enter reptile collections is through the introduction of parasitized animals that haven’t been properly quarantined [2][19][38][41]. Mites can be difficult to detect, especially in low numbers, hiding in skin folds, scale edges, and around the eyes [9]. We recommend a quarantine period of at least 90 days for captive-bred reptiles and up to six months for wild-caught specimens [19][20]. During this time, visual inspections should be performed regularly, and a reptile veterinarian should examine the animal if possible [19][41]. Mites are also commonly introduced through contaminated equipment, substrate, enclosures and/or food items. Most mites can survive off-host for up to a month, waiting for a suitable host [9]. Feeder rodents and contaminated cage substrates can also be sources of mites [45][38]. Human-mediated dispersal, such as on clothing or hands after visiting reptile expos, is another potential route of transmission [19][22][38][41]. It’s one of the reasons we recommend handling animals at shows with care, and ensuring you properly sanitize afterwards! The Explosive Population Growth