> For the complete documentation index, see [llms.txt](https://docs.koins.run/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.koins.run/aspects-of-a-koin/physical-atributes/body-parts/fins.md).
# Fins
Delicate or sharp, a koin’s fins can tell a lot about its personality.
**Cookie**
Most often, these fins are simple enough to allow koins to display their full dexterity.
**Wave**
It seems that several koins like waves so much that they blend in with them. Or is it our impression? Regardless, it’s safe to say they look great.
**Coral**
It’s inevitable to picture the bottom of the sea when we see these not so common fins, that are able to move with the grace of the reef.
**Humming**
These quirky, little fins look like the wings of a hummingbird, and you know how fast those little friends are.
**Eagle**
Rather uncommon, these fins look like a pair of fully extended wings, ready to cross the waters at alarming speeds!
**Dragon**
You have to be very lucky to come across these fins, who hold a mythological presence. But, fear not, the koins aren’t able to breathe fire!
**Specter**
Possibly one of the rarest sets of fins to come across. While they may look sinister, the only master plan koin with these fins are coming up with is how to win all the races!
**Sumi-e**
These unique fins are truly exquisite to look at, if you are lucky enough to come across one. A treat for the eyes.
---
# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.
## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
```
GET https://docs.koins.run/aspects-of-a-koin/physical-atributes/body-parts/fins.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.