THE ANIMAL FILES

Gharial

Gavialis gangeticus

A narrow snout meets less water resistance while catching fish.

Gharials are river crocodilians with long, slender jaws and interlocking teeth. Mature males develop a bulb at the snout tip, while young and adults use different parts of the river. Basking beaches are as important to this aquatic life as the water itself.[1]

Follow the evidence ↓
Gharial
Image: Bo Link from Knoxville, TN, USA · Commons · CC BY 2.0
Feeding structure
Long narrow jaws with interlocking teeth[1]
Male feature
A bulbous snout-tip ghara[1]
Young habitat
Sheltered shallow water, often near fallen wood[1]

Catching a slippery fish

The narrow snout reduces resistance during underwater movements and sharp interlocking teeth retain fish. Young eat insects, tadpoles and other small prey as well. Gharials generally swallow food rather than chewing it. Specialisation for fish therefore does not imply an identical diet at every age or a mouth working like mammalian molars.[1]

A beach for temperature control

Gharials bask near the water, adjusting timing as conditions warm. Sandy banks also provide nesting substrate. Sharing a river with mugger crocodiles does not mean using identical shore sites: muggers range farther onto banks and use steeper surfaces, while gharials are more closely tied to low beaches beside water.[1]

Growing into deeper water

Young gharials shelter and feed in shallows, often around fallen-tree debris. Studied larger animals preferred sites with deeper adjoining water. Adults cannot use the semi-upright terrestrial walk of some other crocodilians. Size changes river use, so protecting only one narrow kind of bank would overlook different developmental needs.[1]

A COMMON MIX-UP

Does fish specialisation mean hatchlings eat only fish?

No. Young also take insects, tadpoles and other small prey.[1]

TRY A LITTLE REASONING

Why might a river need both shallow sheltered areas and deeper channels for gharials?

Reveal the explanation

Different sizes use different depths, with small juveniles relying more on sheltered shallows.[1]

Sources & editorial notes

Adapted and translated from the cited Wikipedia revisions, with source-linked reasoning. Image credit and licence are listed separately above.

Adapted and translated from Wikipedia contributors; exact revisions are linked below. CC BY-SA 4.0

  1. Wikipedia contributors — Gavialis gangeticus (adapted and translated; exact revision)
  2. NCBI Taxonomy — Gavialis gangeticus (identity and game lineage)

Last fact check:

One discovery leads to another

Nile crocodileA closed mouth still leaves a clue.Crocodylus niloticus ↗Saltwater crocodileIts name says saltwater. Its range says more.Crocodylus porosus ↗American alligatorA predator can also reshape a wetland.Alligator mississippiensis ↗