Creating a detailed SVG image of a pelican riding a bicycle involves several steps, including designing the pelican, the bicycle, and how they interact. SVG (Scalable Vector Graphics) is a XML-based vector image format, which means it's resolution-independent and can be scaled without losing quality. Below is a simplified version of such an SVG. Due to the complexity and space limitations, this example will be quite basic and stylized.

```svg
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 200">
  <!-- Pelican -->
  <path fill="#8B4513" stroke="#8B4513" stroke-width="4" d="M50,70 Q80,100 120,80 Q160,60 120,40 Q80,20 50,40"/>
  <circle cx="70" cy="50" r="10" fill="#FFFFFF"/>
  <path fill="#FFFFFF" d="M70,55 Q75,60 80,55 Q85,50 80,45 Q75,40 70,45"/>
  <path fill="#FFFFFF" d="M60,45 Q70,35 80,45 Q90,55 70,55"/>
  <path fill="#FFFFFF" d="M90,55 Q100,45 110,55 Q120,65 100,75"/>
  
  <!-- Bicycle -->
  <path fill="none" stroke="#000000" stroke-width="4" d="M100,60 Q120,80 140,60 Q160,40 140,20 Q120,0 100,20 Q80,40 60,20"/>
  <path fill="#000000" d="M100,60 Q110,70 120,60"/>
  <path fill="#000000" d="M140,60 Q150,50 160,60"/>
  
  <!-- Pelican's Position on Bicycle -->
  <circle cx="110" cy="55" r="5" fill="#FFFFFF"/>
  
</svg>
```

### Explanation:
- **Pelican**: The pelican is represented using basic shapes. The body is a filled brown rectangle with a lighter brown outline, and the head, beak, and eyes are simplified using circles and paths.
- **Bicycle**: The bicycle frame is drawn using lines and rectangles, with the wheels simplified to circles.
- **Pelican on Bicycle**: A small white circle represents the pelican's head positioned on the bicycle.

This SVG is a very basic representation and might not look like a realistic pelican or bicycle. For a more detailed and realistic image, you would need to use more complex paths and shapes, possibly incorporating gradients or images for textures. Additionally, you could enhance the design by adding more details to the pelican and bicycle, such as pedals, handlebars, and a more defined body shape. Tools like Adobe Illustrator, Inkscape, or online SVG editors can help create more intricate designs.

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