--- title: The Congo river: tigerfish, the deepest river, lungfish and hidden birds — a lesson of Mova's school · trees and pragmatics description: «The Congo river: tigerfish, the deepest river, lungfish and hidden birds», a lesson of the biology course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: The Congo is the deepest river known: in places it plunges more than two hundred metres, deeper t --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/biology/160-the-congo-river/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [Biology](https://md.mova.elamur.ai/free/en/corpora/school/biology/) / The Congo river: tigerfish, the deepes… # The Congo river: tigerfish, the deepest river, lungfish and hidden birds Lesson 160 of the biology course of Mova's primary school: 18 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). How Mova does on its tests: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/biology/160-the-congo-river/). - [0](https://md.mova.elamur.ai/free/en/corpora/school/biology/160-the-congo-river/0/) — The Congo is the deepest river known: in places it plunges more than two hundred metres, deeper than a tall tower, cut by fast water over a very long time. - [1](https://md.mova.elamur.ai/free/en/corpora/school/biology/160-the-congo-river/1/) — In its roaring rapids the goliath tigerfish hunts with long dagger teeth that fit together like a trap, and it can grow as big as a large child. - [2](https://md.mova.elamur.ai/free/en/corpora/school/biology/160-the-congo-river/2/) — In the murky water an elephantnose fish cannot see, so it makes weak electricity and feels the world by its electric field, and in dried-up pools a lungfish sleeps in a ball of mud until the rain comes back. - [3](https://md.mova.elamur.ai/free/en/corpora/school/biology/160-the-congo-river/3/) — Cartoon hippos like Gloria in Madagascar swim and dance; real hippos cannot really swim, so they walk and bounce along the bottom and come up to breathe. - [4](https://md.mova.elamur.ai/free/en/corpora/school/biology/160-the-congo-river/4/) — The goliath tigerfish is one of the fiercest river fish, with long teeth that stick out like a crocodile's, and hunts in the fast rough water of the Congo. - [5](https://md.mova.elamur.ai/free/en/corpora/school/biology/160-the-congo-river/5/) — Parts of the Congo River are more than two hundred metres deep, the deepest river known. - [6](https://md.mova.elamur.ai/free/en/corpora/school/biology/160-the-congo-river/6/) — Some fish in the deep rapids are cut off by strong currents deep down in the dark, where eyes and colour matter little, and have become blind and pale. - [7](https://md.mova.elamur.ai/free/en/corpora/school/biology/160-the-congo-river/7/) — The African dwarf crocodile is one of the smallest crocodiles, usually under two metres, and hunts fish and frogs at night in forest streams. - [8](https://md.mova.elamur.ai/free/en/corpora/school/biology/160-the-congo-river/8/) — In some caves dwarf crocodiles have turned orange, possibly from living among bat droppings. - [9](https://md.mova.elamur.ai/free/en/corpora/school/biology/160-the-congo-river/9/) — Hippos cannot really swim; they are so heavy they sink, so they walk or bounce along the bottom with ears and nostrils closed, and come up to breathe. - [10](https://md.mova.elamur.ai/free/en/corpora/school/biology/160-the-congo-river/10/) — Hippos make a red oily fluid on their skin that works like sunscreen and helps stop germs, often called blood sweat, though it is not blood or sweat. - [11](https://md.mova.elamur.ai/free/en/corpora/school/biology/160-the-congo-river/11/) — Elephantnose fish make weak electricity to sense their surroundings and talk to each other in dark, muddy water. - [12](https://md.mova.elamur.ai/free/en/corpora/school/biology/160-the-congo-river/12/) — African lungfish dig into mud when the water dries up, wrap themselves in a slime cocoon and breathe air through a small hole until the rains come, sometimes for years. - [13](https://md.mova.elamur.ai/free/en/corpora/school/biology/160-the-congo-river/13/) — The Congo peafowl, a shy cousin of the Indian peacock, lives only in the Congo forest; a feather in a villager's hat puzzled a scientist years before the bird was named in 1936. - [14](https://md.mova.elamur.ai/free/en/corpora/school/biology/160-the-congo-river/14/) — The African forest buffalo is a smaller, reddish cousin of the savanna buffalo, with swept-back horns that fit dense forest. - [15](https://md.mova.elamur.ai/free/en/corpora/school/biology/160-the-congo-river/15/) — The hammer-headed bat is the largest bat in Africa, and males have huge heads to make loud honking calls that females listen to. - [16](https://md.mova.elamur.ai/free/en/corpora/school/biology/160-the-congo-river/16/) — The Congo River has more than seven hundred kinds of fish, many found nowhere else, and new kinds are still described almost every year. - [17](https://md.mova.elamur.ai/free/en/corpora/school/biology/160-the-congo-river/17/) — African pygmy kingfishers are tiny kingfishers that mostly hunt insects in woods, not fish in rivers. - ← previous: [The Congo rainforest: gorillas, bonobos, okapis and forest elephants](https://md.mova.elamur.ai/free/en/corpora/school/biology/159-the-congo-rainforest/) - next →: [Borneo: orangutans, proboscis monkeys, the biggest flower and gliding snakes](https://md.mova.elamur.ai/free/en/corpora/school/biology/161-borneo-orangutans-proboscis-monkeys-and-the-biggest-flower/) - ↑ back to [Biology](https://md.mova.elamur.ai/free/en/corpora/school/biology/)