---
title: An ostrich's eye is about 5 centimetres across, the biggest of any l… — Myth check: do ostriches bury their heads in the… · tree and pragmatics
description: An ostrich's eye is about 5 centimetres across, the biggest of any land animal and bigger than its own brain. Who acts: eye. A sentence of the lesson «Myth check: do ostriches bury their heads in the sand?» of the biology course of Mova's primary school with its dependency tree and the pragmatics of
---

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# Myth check: do ostriches bury their heads in the sand?, sentence 11

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An ostrich's eye is about 5 centimetres across, the biggest of any land animal and bigger than its own brain.

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**Who acts:** eye · **What happens:** be · **To what, where:** 5 centimetres

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This is a sentence of the lesson «Myth check: do ostriches bury their heads in the sand?» of the biology course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (eye), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:biology:151-ostriches-and-heads-in-the-sand.lesson:11
# text = An ostrich's eye is about 5 centimetres across, the biggest of any land animal and bigger than its own brain.
# source = school lesson (ours)
# course = biology
# lesson = 151-ostriches-and-heads-in-the-sand.lesson
# annotation = Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R7-rel-agree ×1
1	An	a	DET	DT	Definite=Ind|PronType=Art	2	det	_	_
2	ostrich	ostrich	NOUN	NN	Number=Sing	4	nmod:poss	_	_
3	's	's	PART	POS	_	2	case	_	_
4	eye	eye	NOUN	NN	Number=Sing	8	nsubj	_	_
5	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	8	cop	_	_
6	about	about	ADV	RB	_	7	advmod	_	_
7	5	5	NUM	CD	NumForm=Digit|NumType=Card	8	nummod	_	_
8	centimetres	centimetre	NOUN	NNS	Number=Plur	0	root	_	_
9	across	across	ADV	RB	_	8	advmod	_	_
10	,	,	PUNCT	,	_	8	punct	_	_
11	the	the	DET	DT	Definite=Def|PronType=Art	12	det	_	_
12	biggest	big	ADJ	JJS	Degree=Sup	4	appos	_	_
13	of	of	ADP	IN	_	16	case	_	_
14	any	any	DET	DT	PronType=Ind	16	det	_	_
15	land	land	NOUN	NN	Number=Sing	16	compound	_	_
16	animal	animal	NOUN	NN	Number=Sing	12	obl	_	Agree=R7-rel-agree|Haiku=12:nmod
17	and	and	CCONJ	CC	_	18	cc	_	_
18	bigger	big	ADJ	JJR	Degree=Cmp	12	conj	_	_
19	than	than	ADP	IN	_	22	case	_	_
20	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	22	nmod:poss	_	_
21	own	own	ADJ	JJ	Degree=Pos	22	amod	_	_
22	brain	brain	NOUN	NN	Number=Sing	18	obl	_	_
23	.	.	PUNCT	.	_	8	punct	_	_
```

## Pragmatics {#pragmatics}

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- form: statement
- act: assert
- voice: narrator
- polarity: none
- teacher: kept the draft

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| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is a** | present | a ostrich's eye | 5 centimetres |  |  |  | across *property* | tree rules |

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One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

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**Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)**, as the whole of Mova corpus 0.4, of which this treebank (the agreed school, `mova-school-agreed-en.conllu`) is part. The lessons were written for Mova's primary school. Sentence `school:biology:151-ostriches-and-heads-in-the-sand.lesson:11`.

**The tree:** Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R7-rel-agree ×1. **The frames** are read from the tree by Mova's frames reader (`prag`) when this page is built, the lesson read in order, so a pronoun may be resolved from an earlier sentence.

See the [release 0.4](https://md.mova.elamur.ai/free/en/releases/0.4/).

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- ← previous: [Myth check: do ostriches bury their he…, 10](https://md.mova.elamur.ai/free/en/corpora/school/biology/151-ostriches-and-heads-in-the-sand/10/)
- next →: [Myth check: do ostriches bury their he…, 12](https://md.mova.elamur.ai/free/en/corpora/school/biology/151-ostriches-and-heads-in-the-sand/12/)
- ↑ back to [the lesson](https://md.mova.elamur.ai/free/en/corpora/school/biology/151-ostriches-and-heads-in-the-sand/)