The diagrams below show the development of the horse over a period of 40 million years.

Horse Development Evolution 40 Million Years Diagram - IELTS Writing Task 1

You should spend about 20 minutes on this task.

Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

Write at least 150 words.

A student's answer to this task, and the feedback on it

Written by an IELTSX user under exam conditions and published unedited and anonymously. Band 9 · 213 words.

The diagrams illustrate the evolutionary development of the horse over a period of 40 million years, highlighting changes in both physical size and foot structure.

Overall, it is clear that horses evolved from a small, multi-toed animal into a much larger modern species with a single hoof. Throughout the period, there was a steady increase in body size accompanied by a reduction in the number of toes.

Forty million years ago, Eohippus was a relatively small creature with a short body and thin legs. Its feet consisted of four distinct toes, allowing it to move across soft ground. By 30 million years ago, this species had evolved into Mesohippus, which was noticeably larger and more robust. At this stage, the number of toes had decreased to three, with the central toe becoming more prominent.

Fifteen million years ago, Merychippus emerged, showing further growth in size and stronger limbs. Although it still possessed three toes, the middle toe was dominant, suggesting a shift toward supporting more body weight. In contrast, the modern horse is significantly larger and more muscular, and its foot structure has fully adapted to running, consisting of a single enlarged hoof.

In summary, the diagrams demonstrate a clear evolutionary trend toward increased size, stronger limbs, and simplified foot structure over time.

Examiner feedback

This is a model Band 9 response. It provides a concise yet comprehensive overview of the evolutionary process, accurately using all provided data while maintaining a sophisticated and natural academic tone.

Task Achievement - 9

- All requirements of the task are fully satisfied, including a clear overview and detailed description of all evolutionary stages. - Key features (size increases and toe reduction) are skillfully selected and highlighted. - Data points (years) are accurately integrated into the description without being mechanical.

Coherence & Cohesion - 9

- The message can be followed effortlessly from the earliest stage to the modern horse. - Paragraphing is logically managed, grouping earlier stages and later stages effectively. - Cohesive devices (In contrast, Throughout the period, At this stage) are used naturally and do not attract attention.

Lexical Resource - 9

- A wide range of vocabulary is used accurately and appropriately (e.g., 'robust', 'prominent', 'dominant', 'simplified'). - Natural control of lexical features is evident in descriptions of physical changes. - Spelling and word formation are flawless.

Grammatical Range & Accuracy - 9

- A wide range of structures is used with full flexibility and control (e.g., 'accompanied by a reduction', 'allowing it to move', 'suggesting a shift'). - Grammar and punctuation are accurate throughout the response. - Sentence structures vary in length and complexity to maintain flow.

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