Creating a detailed SVG image of a pelican riding a bicycle involves several steps, including designing the pelican, the bicycle, and their interaction. Below is a simplified version of such an SVG. Please note that creating a highly detailed and realistic image would require more complex vector graphics software and a more detailed design.

```svg
<svg width="400" height="300" viewBox="0 0 400 300" xmlns="http://www.w3.org/2000/svg">
  <!-- Pelican -->
  <path fill="#228B22" stroke="#000" stroke-width="4" d="
    M 100,150
    C 120,80 180,80 200,150
    L 300,150
    C 320,220 360,220 380,150
    Z"/>
  <!-- Beak -->
  <path fill="#8B0000" d="M 120,120 Q 150,80 180,120"/>
  <!-- Eyes -->
  <circle cx="130" cy="110" r="5" fill="#FFFFFF"/>
  <circle cx="170" cy="110" r="5" fill="#FFFFFF"/>
  <!-- Wings -->
  <path fill="#228B22" d="M 150,50 L 250,50 L 200,150 Z"/>
  <path fill="#228B22" d="M 250,50 L 150,150 L 200,150 Z"/>
  <!-- Bicycle -->
  <ellipse fill="#FFFFFF" stroke="#000" stroke-width="4" cx="300" cy="200" rx="60" ry="30"/>
  <!-- Front Wheel -->
  <circle fill="#000" cx="300" cy="210" r="15"/>
  <!-- Handlebars -->
  <path fill="#000" d="M 300,230 Q 320,250 340,230"/>
  <!-- Pedals -->
  <path fill="#000" d="M 280,220 L 310,250 L 330,220 Z"/>
  <!-- Seat -->
  <path fill="#228B22" d="M 310,240 Q 320,250 330,240"/>
</svg>
```

This SVG code creates a very basic illustration of a pelican riding a bicycle. The pelican is represented with a simplified body shape, a beak, eyes, and wings. The bicycle is drawn with a simplified frame, a front wheel, handlebars, and pedals. The colors are basic and stylized for simplicity.

For a more detailed and realistic image, consider using vector graphics software like Adobe Illustrator, Inkscape, or online tools that allow for more intricate design and color customization. You would need to manually design each element, paying close attention to details like the pelican's anatomy, the bicycle's mechanics, and the interaction between the two.

> EOF by user