--- title: "Year 3- Science-Identifying Endoskeletons, Exoskeletons, and Hydrostatic Skeletons" url: "https://stbarnabasdarwen.co.uk/news/2025-11-24-year-3-science-identifying-endoskeletons-exoskeletons-and-hydrostatic-skeletons" school: "St Barnabas Primary School, A Church of England Academy" --- We are holding a number of open days for children due to start primary school in September 2027. Please see our admissions page for further details. Everyone welcome! # Year 3- Science-Identifying Endoskeletons, Exoskeletons, and Hydrostatic Skeletons ![](https://files.schudio.com/st-barnabas-primary-school/images/news/activitymore-23DC6EE2-F10A-420E-922A-BFEB95F9DF8B.png) 24 November 2025 This afternoon, our young scientists (supported by our excellent Science Ambassadors, Elijah and Harry) were busy investigating the frameworks that support life. We started by recalling the difference between vertebrates (animals with a backbone) and invertebrates (animals without one), and defining what a skeleton is. The main task was to become Skeleton Detectives, researching various animals to identify whether they possess an endoskeleton (internal, like humans and fish), an exoskeleton (external armor, like crabs and insects), or a hydrostatic skeleton (fluid-filled, like earthworms and jellyfish). For the final challenge, the children discovered an interesting fact about each animal's framework, explaining exactly how that specific skeleton helps them with movement and protection, showcasing their excellent understanding of biological support systems.![](https://stbarnabasdarwen.co.uk/images/news/activitymore-23DC6EE2-F10A-420E-922A-BFEB95F9DF8B.png) [Year 3](https://stbarnabasdarwen.co.uk/news/tag/year-3) [Science](https://stbarnabasdarwen.co.uk/news/tag/science) [![](https://files.schudio.com/st-barnabas-primary-school/imagecache/100x100c/news/B539B15E-F3FC-4F0B-99E6-AD98FF86DEE6.jpeg)](https://stbarnabasdarwen.co.uk/news/2025-11-21-friday-celebration-worship) Previous ### [Friday Celebration Worship](https://stbarnabasdarwen.co.uk/news/2025-11-21-friday-celebration-worship) [![](https://files.schudio.com/st-barnabas-primary-school/imagecache/100x100c/news/IMG_1771.jpeg)](https://stbarnabasdarwen.co.uk/news/2025-11-25-year-5-science) Next ### [Year 5 - Science](https://stbarnabasdarwen.co.uk/news/2025-11-25-year-5-science) ### Personal Development - [News](https://stbarnabasdarwen.co.uk/news) - [Events](https://stbarnabasdarwen.co.uk/events) - [Photo Gallery](https://stbarnabasdarwen.co.uk/photo-gallery-category/our-gallery) - [Calendar](https://stbarnabasdarwen.co.uk/calendar) - [School Council](https://stbarnabasdarwen.co.uk/academy-life/school-council) - [Attendance](https://stbarnabasdarwen.co.uk/academy-life/attendance) - [Fundraising](https://stbarnabasdarwen.co.uk/academy-life/fundraising) - [Extra Curricular Clubs](https://stbarnabasdarwen.co.uk/academy-life/clubs) - [Little Leaders](https://stbarnabasdarwen.co.uk/academy-life/little-leaders) - [Visits and Visitors](https://stbarnabasdarwen.co.uk/visits-and-visitors) - [British Values](https://stbarnabasdarwen.co.uk/british-values) - [Protected Characteristics](https://stbarnabasdarwen.co.uk/protected-characteristics) ##### Location Knowlesly Road Darwen Lancashire BB3 2JA ##### Contact Us 01254 702996 ##### Stay Connected - [Facebook](https://www.facebook.com/stbarnabasce/) - [X](https://twitter.com/stbarnabasce) © Copyright 2021–2026 St Barnabas Primary School, A Church of England Academy School & Trust Websites by [ ![Schudio logo](https://stbarnabasdarwen.co.uk/img/logo/light.png) ](https://www.schudio.com/)