biology

Mugger crocodile

Mugger crocodile is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Mugger crocodile rather than just read about it. In short: The mugger crocodile (Crocodylus palustris) is a medium-sized broad-snouted crocodile, also known as mugger and marsh crocodile. It is native to freshwater habitats from south-eastern Iran to the Indian subcontinent, where it inhabits marshes, lakes, rivers and artificial ponds.

Key takeaways

Mugger crocodile belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Mugger crocodile to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Mugger crocodile from memory before moving on to harder problems.

Reference excerpt

The mugger crocodile (Crocodylus palustris) is a medium-sized broad-snouted crocodile, also known as mugger and marsh crocodile. It is native to freshwater habitats from south-eastern Iran to the Indian subcontinent, where it inhabits marshes, lakes, rivers and artificial ponds. It rarely reaches a body length of 5 m (16 ft 5 in) and is a powerful swimmer, but also walks on land in search of suitable waterbodies during the hot season. Both young and adult mugger crocodiles dig burrows to which they retreat when the ambient temperature drops below 5 °C (41 °F) or exceeds 38 °C (100 °F). Females dig holes in the sand as nesting sites and lay up to 46 eggs during the dry season. The sex of hatchlings depends on temperature during incubation. Both parents protect the young for up to one year. They feed on insects, and adults prey on fish, reptiles, birds and mammals. The mugger crocodile evolved at least 4.19 million years ago and has been a symbol for the fructifying and destructive powers of the rivers since the Vedic period. It was first scientifically described in 1831 and is protected by law in Iran, India and Sri Lanka. Since 1982, it has been listed as Vulnerable on the IUCN Red List. Outside protected areas, it is threatened by conversion of natural habitats, gets entangled in fishing nets and is killed in human–wildlife conflict situations and in traffic accidents.

Taxonomy Crocodilus palustris was the scientific name proposed by René Lesson in 1831 who scientifically described the type specimen from the Gangetic plains. In subsequent years, several naturalists and curators of natural history museums described zoological specimens and proposed different names, including:

C. bombifrons by John Edward Gray in 1844 for a specimen sent by the Museum of the Royal Asiatic Society of Bengal to the British Museum of Natural History. C. trigonops also by Gray in 1844 for a young mugger specimen from India.

Evolution Phylogenetic analysis of 23 crocodilian species indicated that the genus Crocodylus most likely originated in Australasia about 13.72 to 8.28 million years ago. The freshwater crocodile (C. johnstoni) is thought to have been the first species that genetically diverged from the common ancestor of the genus about 12.45 to 7.17 million years ago. The sister group comprising saltwater crocodile (C. porosus), Siamese crocodile (C. siamensis) and mugger crocodile diverged about 11.65 to 6.52 million years ago. The latter diverged from this group about 8.91 to 4.19 million years ago. A paleogenomics analysis indicated that Crocodylus likely originated in Africa and radiated towards Southeast Asia and the Americas, diverging from its closest recent relative, the extinct Voay of Madagascar, around 25 million years ago near the Oligocene/Miocene boundary. Within Crocodylus, the mugger crocodile's closest living relatives are the Siamese crocodile and the saltwater crocodile. Fossil crocodile specimens excavated in the Sivalik Hills closely resemble the mugger crocodile in the shortness of the premaxillae and in the form of the nasal openings. In Andhra Pradesh's Prakasam district, a 30.6 cm (12.0 in) long fossilized skull of a mugger crocodile was found in a volcanic ash bed that probably dates to the late Pleistocene. Crocodylus palaeindicus from late Pliocene sediments in the Sivalik Hills is thought to be an ancestor of the mugger crocodile. Fossil remains of C. palaeindicus were also excavated in the vicinity of Bagan in central Myanmar.

Below cladogram is from a tip dating study, for which morphological, molecular DNA sequencing and stratigraphic fossil age data were simultaneously used to establish the inter-relationships within Crocodylidae. This cladogram was revised in a paleogenomics study.

Characteristics

Mugger crocodile hatchlings are pale olive with black spots. Adults are dark olive to grey or brown. The head is rough without any ridges and large scutes around the neck that is well separated from the back; the scutes usually form four, rarely six longitudinal series and 16 or 17 transverse series. The limbs have keeled scales with serrated fringes on the outer edges, and outer toes are extensively webbed. The snout is slightly longer than broad with 19 upper teeth on each side. The symphysis of the lower jaw extends to the level of the fourth or fifth tooth. The premaxillary suture on the palate is nearly straight or curved forwards, and the nasal bones separate the premaxilla above. The mugger crocodile is considered a medium-sized crocodilian, but has the broadest snout among living crocodiles. It has a powerful tail and webbed feet. Its visual, hearing and smelling senses are acute. Adult female muggers are 2 to 2.5 m (6.6 to 8.2 ft) on average; males usually measure 3 to 3.5 m (9.8 to 11.5 ft), but rarely reach a length of 5 m (16 ft). The two largest known muggers measured 5.63 m (18.5 ft) and were killed in Sri Lanka. One male mugger caught in Pakistan of about 3 m (9.8 ft) weighed 195 kg (430 lb). One individual weighing 207 kg (456 lb) had a bite force of 7,295 N (1,640 lbf).

Distribution and habitat

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Mugger crocodile

Start with the simplest possible case. Write down what Mugger crocodile claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Mugger crocodile before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Mugger crocodile ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Mugger crocodile

In research: Mugger crocodile appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Mugger crocodile in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Mugger crocodile is common in secondary-school and first-year university syllabi. It links to neighbouring topics Apex predators, Crocodilians of Asia, Crocodylidae, so understanding it makes those chapters shorter.
In everyday life: Look for Mugger crocodile outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Mugger crocodile in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Mugger crocodile means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Mugger crocodile out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Mugger crocodile in simple terms?

Why does Mugger crocodile matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Mugger crocodile?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Mugger crocodile.