Rock-wallaby

Rock-wallabies are small animals.

They stay in their rocky homes during the day. At night, they come out to find food. They are very good at moving in tight spaces.

Some rock-wallabies live in groups. They stay close to their rocky homes. They do not move very far away at night.

These animals have faced many problems. Some groups have died out. Foxes and goats can be a danger to them.

People are working hard to help them. They use special fences to keep them safe. This helps the rock-wallabies grow in number.

Rock-wallabies are small to medium marsupials. A marsupial is a type of animal that carries young in a pouch. There are many species of rock-wallaby. They belong to a group called Petrogale.

These animals are very agile. They live in steep and rocky places. They use caves or cliffs for shelter during the day. At night, they come out to find food. Most of their activity happens after sunset and before sunrise. They usually stay within two kilometres of their home.

Rock-wallabies live in small groups or colonies. They like three kinds of homes. Some live in piles of large rocks. Others live on cliffs with many ledges. Some live on tall rock stacks.

Many rock-wallaby groups have faced hard times. Their numbers dropped after European people arrived in Australia. Red foxes are a major reason for this. Goats, sheep, and rabbits also cause problems. Some groups even died out in the south. Scientists now use special fences to keep them safe. They also use captive breeding. This means they raise them in care to help wild numbers grow.

Rock-wallabies are agile marsupials that belong to the genus Petrogale. This group is the most diverse of all macropods, which are a family of animals like kangaroos. Scientists have identified 19 different species in this group. Some researchers even found more hidden species during reviews in 2014. These animals range from small to medium in size. The males are usually a bit larger than the females. They can grow to have a body length of up to 60 centimeters.

These animals live a very busy life in the dark. They are nocturnal, which means they are most active at night. During the day, they hide in steep and rocky places for safety. They might stay in a cave, an overhang, or thick plants. Most of their activity happens three hours before sunrise and after sunset. They do not wander too far from their homes. Most rock-wallabies stay within two kilometers of their daytime shelter.

Rock-wallabies like to live in specific types of rocky homes. Some species prefer large piles of boulders with many narrow paths. Others like cliffs that have many ledges and caves. Some even live on tall, steep rock stacks. Because these rocky spots are spread out, wallaby groups are often isolated. This isolation can cause groups to become different from each other. This happens because they stay in small colonies with overlapping home ranges.

We know more about these animals thanks to history. A man named John Edward Gray established the genus Petrogale in 1837. He worked at the British Museum of Natural History. Gray chose the brush-tailed rock-wallaby as the main type species. He moved these animals out of a different group called Kangurus. Today, scientists use DNA to study how the different species are related. This helps them understand the many groups, like the short-eared or yellow-footed species.

Many rock-wallaby groups have faced hard times recently. Their numbers dropped a lot after European colonisation in Australia. Red foxes are a major reason why many colonies have disappeared. Other animals like goats, sheep, and rabbits also cause problems. In 1988, 80 wallabies were released at Jenolan Caves in New South Wales. By 1992, only about seven were left. Now, scientists use special fences to keep out foxes and cats. They also use captive breeding as an insurance policy to help wild numbers grow again.

Rock-wallabies are agile marsupials belonging to the genus *Petrogale*. This genus is the most diverse group of macropods, which is the family of animals that includes kangaroos. Scientists have identified 19 distinct species within this group. Some researchers also found additional cryptic taxa during taxonomic revisions in 2014. These animals vary in size from relatively small to medium-sized. Generally, males are slightly larger than females. A male can reach a body length of up to 60 centimeters.

These animals follow a nocturnal lifestyle, meaning they are most active during the night. They seek refuge in steep, rugged, and rocky terrain during the day. Their shelters include caves, rock overhangs, or thick vegetation. This allows them to maintain a fortress-like existence for safety. Their peak activity occurs three hours before sunrise and after sunset. Even when foraging at night, they rarely travel further than two kilometers from their daytime refuges.

Rock-wallabies rely on specific types of rocky environments to survive. There are three main categories of preferred habitat. Some species live among loose piles of large boulders that contain a maze of passageways. Others prefer cliffs that feature many mid-level ledges and caves. A third type lives on isolated, sheer-sided rock stacks that are often surrounded by fallen boulders. Because these suitable habitats are patchy and limited, different colonies often become isolated from one another. This isolation leads to genetic differentiation between the groups.

Different species are organized into specific alliances or species groups. One group is the *P. brachyotis* species group, which includes the short-eared rock-wallaby and the Monjon. Another is the *P. xanthopus* species group, containing the yellow-footed rock-wallaby and the Rothschild's rock-wallaby. There is also the *P. lateralis/penicillata* group. This group includes the black-flanked rock-wallaby and the brush-tailed rock-wallaby. Genetic analysis has confirmed these relationships, though studies have revealed a phenomenon called cytonuclear discordance. This occurs when mitochondrial and nuclear DNA sequences produce different phylogenetic trees.

The study of these animals has a long history. John Edward Gray established the genus *Petrogale* in 1837. He performed this work during a revision of materials at the British Museum of Natural History. Gray named the brush-tailed rock-wallaby, *Petrogale penicillata*, as the type species. He separated these animals from the defunct genus *Kangurus*. Gray proposed to divide the known macropod species during his synopsis. This classification helped scientists organize the many different types of wallabies we recognize today.

Many rock-wallaby populations have faced severe declines since European colonisation. In the south, some populations have become extinct. One notable example occurred at Jenolan Caves in New South Wales. In 1988, a caged population of 80 rock-wallabies was released to help a local wild population. However, by 1992, the total population had dropped to only about seven individuals. To save the survivors, scientists placed them in an enclosure that is proof against foxes and cats. Since then, the numbers in that captive population have begun to increase.

Several factors contribute to the ongoing threat of extinction for these colonies. Red foxes are considered a major cause of recent population losses. Other competing herbivores, such as goats, sheep, and rabbits, also impact their survival. Diseases like toxoplasmosis and hydatidosis present further risks. Additionally, habitat fragmentation and lower genetic health due to isolation make it harder for colonies to thrive. Conservationists use captive breeding as an "insurance policy" to boost wild numbers. For the yellow-footed rock-wallaby, these recovery strategies have successfully prevented extinction in New South Wales.