--- title: Counting animals: eyes, ears, hearts, trunks, tentacles, teeth — a lesson of Mova's school · trees and pragmatics description: «Counting animals: eyes, ears, hearts, trunks, tentacles, teeth», a lesson of the biology course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: Counting an animal's parts is a real scientist's game: how many hearts, eyes, legs or teeth it has tells yo --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/biology/41-counting-animals/) [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/) / Counting animals: eyes, ears, hearts,… # Counting animals: eyes, ears, hearts, trunks, tentacles, teeth Lesson 41 of the biology course of Mova's primary school: 15 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/41-counting-animals/). - [0](https://md.mova.elamur.ai/free/en/corpora/school/biology/41-counting-animals/0/) — Counting an animal's parts is a real scientist's game: how many hearts, eyes, legs or teeth it has tells you how it lives, and the numbers are often stranger than any cartoon. - [1](https://md.mova.elamur.ai/free/en/corpora/school/biology/41-counting-animals/1/) — We have one heart, two eyes and two ears on the head, but an octopus has three hearts, a scallop can have about 200 eyes, and a cricket hears with ears on its knees. - [2](https://md.mova.elamur.ai/free/en/corpora/school/biology/41-counting-animals/2/) — Wiggle your wobbly milk tooth in the bathroom mirror and count: you have 20 milk teeth and will get just one more set, while a shark keeps growing new teeth all its life like a conveyor belt. - [3](https://md.mova.elamur.ai/free/en/corpora/school/biology/41-counting-animals/3/) — In cartoons octopuses wave «tentacles», every spider has two big eyes and the centipede proudly wears 100 shoes; real animals break every one of those rules, so always count for yourself. - [4](https://md.mova.elamur.ai/free/en/corpora/school/biology/41-counting-animals/4/) — An octopus has 3 hearts: two small gill hearts push its blue, copper-based blood through the gills, and one main heart pumps it round the body; copper-based blood carries oxygen less well than our red blood, so the extra pumps help. - [5](https://md.mova.elamur.ai/free/en/corpora/school/biology/41-counting-animals/5/) — An earthworm has 5 pairs of simple muscular tubes near its front end that squeeze its red blood along, often called its 5 pairs of hearts; it has no lungs and breathes through its damp skin. - [6](https://md.mova.elamur.ai/free/en/corpora/school/biology/41-counting-animals/6/) — Most spiders have 8 eyes, usually in two or three rows; some kinds have 6 or fewer and some cave spiders have none, and many web-builders feel the world through the vibrations of their silk. - [7](https://md.mova.elamur.ai/free/en/corpora/school/biology/41-counting-animals/7/) — A scallop can have up to about 200 tiny eyes, often bright blue dots, along the edge of its body between the two shells; each focuses light with a tiny curved mirror, and it spots shadows such as a hungry starfish, and then swims away by clapping its two shells together. - [8](https://md.mova.elamur.ai/free/en/corpora/school/biology/41-counting-animals/8/) — An elephant has 1 trunk, its nose and upper lip joined into one boneless tube with tens of thousands of muscle bundles, often counted at about 40,000; it sucks up a few litres of water at a time and squirts it into its mouth. - [10](https://md.mova.elamur.ai/free/en/corpora/school/biology/41-counting-animals/10/) — A shark has several rows of teeth that move forward like a conveyor belt, and it can lose and regrow thousands of teeth in its life, so fossil shark teeth are common on some beaches. - [11](https://md.mova.elamur.ai/free/en/corpora/school/biology/41-counting-animals/11/) — A snail eats with a radula, a ribbon covered in thousands of tiny teeth, often quoted at about 14,000 for a garden snail, which rasps food like a file. - [12](https://md.mova.elamur.ai/free/en/corpora/school/biology/41-counting-animals/12/) — Children have 20 milk teeth, which fall out roughly from age 6 to 12; adults have 32 teeth if all four wisdom teeth come in, and a lost adult tooth never grows back. - [13](https://md.mova.elamur.ai/free/en/corpora/school/biology/41-counting-animals/13/) — Most starfish have 5 arms with a simple eye at the tip of each, some sun stars have 20 or more, and a starfish can slowly regrow a lost arm, which is why one arm may be shorter; look at rock-pool animals and leave them where they are. - [14](https://md.mova.elamur.ai/free/en/corpora/school/biology/41-counting-animals/14/) — A cricket has 2 ears, tiny drum-like patches just below the knees of its front legs; grasshoppers have their ears on the sides of the belly. - [15](https://md.mova.elamur.ai/free/en/corpora/school/biology/41-counting-animals/15/) — No centipede has exactly 100 legs: they have from 15 to 191 pairs, always an odd number of pairs; the leggiest known animal is an Australian millipede found in 2021 with 1,306 legs. - ← previous: [Counting animals: legs, arms, wings and tails](https://md.mova.elamur.ai/free/en/corpora/school/biology/40-counting-legs-arms-wings-and-tails/) - next →: [The capybara: the calmest animal, friend of crocodiles?](https://md.mova.elamur.ai/free/en/corpora/school/biology/42-the-capybara/) - ↑ back to [Biology](https://md.mova.elamur.ai/free/en/corpora/school/biology/)