How to Determine if Your Hermit Crab is a Male or a Female

Hermit crabs are fascinating creatures to keep as pets. However, to properly care for your pet hermit crab, it is important to know whether it is a male or female. Knowing the gender of your hermit crab can be helpful in providing appropriate care, including meeting their nutritional needs, identifying reproductive behaviors, safely housing multiple crabs, and even breeding them. In this blog post, we will discuss how you can determine whether your hermit crab is a male or female.

Background Information on Hermit Crabs

Before we dive into the specifics of determining your hermit crab’s gender, let’s take a look at some background information about these creatures.

Hermit crabs are crustaceans and are classified under the superfamily Paguroidea. There are many different species of hermit crabs, but some of the most popular ones kept as pets include the Caribbean hermit crab (Coenobita clypeatus), Ecuadorian hermit crab (Coenobita compressus), Australian land hermit crab (Coenobita variabilis), and the strawberry hermit crab (Coenobita perlatus).

Hermit crabs are omnivorous, which means that their diet includes both plants and animals. They eat a variety of foods, including fruits, vegetables, meat, and seafood. Hermit crabs require a specific habitat to live in which includes a substrate for digging, climbing structures, hiding spots, and freshwater and saltwater pools.

Importance of Knowing Your Hermit Crab’s Gender

Knowing whether your hermit crab is a male or female is important because it can help you provide appropriate care. Male and female hermit crabs have slightly different needs, so identifying the gender of your pet can help ensure that you are meeting those needs. Additionally, knowing the gender of your hermit crab can help you recognize certain behaviors related to reproduction.

Male vs. Female Hermit Crab Anatomy

Male and female hermit crabs have subtle anatomical differences that are not always obvious. Here are some of the key differences to look for:

Exoskeleton and Body Structure

The cephalothorax is the body region where the head and legs are located, while the abdomen is the soft tissue that is protected by the shell. In general, male hermit crabs tend to have narrower and more elongated abdomens than females.

Antennae are sensory organs that are used for detecting the environment and can also be involved in communication with other crabs. Males usually have longer antennae than females.

Eyes are also present on the crab’s cephalothorax, and males often have larger eyes than females.

Differences in Gonopores

Gonopores are openings that organisms use for reproductive purposes. In male hermit crabs, the gonopore is located on the coxae of the fifth pair of walking legs. In female hermit crabs, it is located on the coxae of the third pair of walking legs.

Males typically have a small, round, and slightly raised gonopore, while females have a longer, flatter, and more prominent gonopore.

Differences in Abdominal Pleopods

Pleopods are modified legs used for carrying eggs in females. In male hermit crabs, the pleopods are smaller and less pronounced than in females. The female’s pleopods are larger and more prominent because they are adapted for the task of carrying and protecting eggs during the incubation period.

How to Safely Handle and Sex a Hermit Crab

Before attempting to sex your hermit crab, it is important to know how to properly handle them. Here are some tips for safely handling your pet:

  1. Allow the crab to walk onto your hand
  2. Support the crab’s body and shell to avoid falls
  3. Be patient and gentle

Once you are comfortable handling your hermit crab, you can look for the following gender-specific features:

  1. Legs. Male and female hermit crabs have slightly different leg structures. Males tend to have larger claws or pincers on the front pair of legs, while females may have smaller or more equal-sized claws.
  2. Gonopores. After examining the legs, look for the gonopores. You’ll need to gently lift the tail over the abdomen to see the openings. As mentioned earlier, the gonopores are located on different pairs of legs depending on the crab’s gender.
  3. Pleopods. Finally, look at the pleopods to determine your crab’s gender. Female crabs will typically have larger and more pronounced pleopods, while male crabs tend to have smaller and less noticeable ones.

Be very careful when handling your hermit crab and avoid holding them for long periods of time. Remember, these creatures live in shells because they need protection from predators.

Typical Reproductive Behavior in Hermit Crabs

Male and female hermit crabs interact differently when it comes to reproduction. During mating season, males may chase females and try to mount them in order to transfer sperm. Females who have been fertilized will become “gravid,” meaning they are carrying fertilized eggs. These eggs will eventually be deposited in saltwater, and the female will guard them until they hatch.

Meeting the Needs of Male and Female Hermit Crabs

Providing proper care for your hermit crab requires knowing their specific needs. Here are some basic considerations:

Appropriate Tank Setup

  • Tank size should be suitable for your hermit crab(s)
  • Substrate for digging and burrowing
  • Climbing structures for exercise
  • Hiding spots and a dark area for sleeping and molting

Balanced Diet

  • Protein sources (dried shrimp or insects, cooked chicken, etc.)
  • Calcium-rich foods (cuttlebone, eggshells, etc.)
  • Vegetables and fruits (such as carrots, apples, and strawberries)
  • Commercial foods (prepared for hermit crab diets)

Temperature and Humidity

  • The appropriate tank temperature is around 75 to 80 degrees Fahrenheit
  • Humidity should be maintained between 70% to 80%.
  • Monitoring and maintaining these conditions will help your hermit crab grow healthy.

Fresh and Saltwater Pools

  • Your hermit crab will need both fresh and saltwater pools to drink, bathe, and help them molt.

Regular Cleaning and Maintenance

  • Hermit crabs are relatively easy to care for but do need a clean environment.
  • Clean the tank regularly with a mild soap and water solution, and provide clean water regularly.

Frequently Asked Questions About Hermit Crabs’ Gender

1. How long do hermit crabs live? Hermit crabs usually live for around 10 years in captivity, but with proper care, they can live up to 30 years.

2. Can you house male and female hermit crabs together? It is not recommended to house male and female hermit crabs together, especially if they are of breeding age. If you want to breed your hermit crabs, you should house them separately and only introduce them when it’s time to mate.

3. What is the best tank setup for breeding hermit crabs? A breeding tank should have plenty of substrate for the female to lay her eggs and adequate food and water sources. The tank should be large enough to accommodate the number of crabs you are breeding.


Determining whether your hermit crab is a male or female is crucial for maintaining their health and well-being. To determine your crab’s gender, pay attention to its leg structures, gonopores, and pleopods. Be careful when handling your crab and avoid holding them for long periods of time. Providing proper care for your hermit crab requires knowing their specific needs, including temperature, humidity, substrate, climbing structures, hiding spots, food, and water sources. By following these tips, you’ll be equipped to provide your hermit crab with the best care possible.