Solution:

Chicken-8

Explanation:
Let's start with distinct features

Chicken-2 has an extra toe.
Chicken-3 has fewer tail feathers.
Chicken-5 has only one thigh crease.
Chicken-6 has an extra feather around the neck.
Chicken-7 is looking up.
Chicken-8 has a longer butt crease.

But this riddle is not about the features. The different chicken is 8 as cannot be seen by any chicken.

Solution:

Look at the eyes of all the three images. The second one has eyes positioned at different places. This is why the second image is the odd one out.

Solution:

Shape A

Shape A features an inner figure(dark black) in the form of a trapezoid.
Conversely, shapes B, C, and D all exhibit an inner figure shaped as a triangle.

As a result, the image that deviates from this pattern is Shape A, making it the odd one out.

Solution:

Letter E

All the other letters have rounded or curved segments in their designs, while "E" has straight lines and angles.

Solution:

The circled owl is looking away from the rest and hence antisocial.

Solution:

3rd.

In all the structure, we can find 2 rectangles are found except one i.e 3rd.

Solution:

You can only find it out if you look closely. The second and the fourth cat are identical. In the picture, we have explained how.

Solution:

Shape d

Rotating Shape A by 90 degrees counterclockwise aligns it with Shape B.

Rotating Shape A by 90 degrees clockwise aligns it with Shape C.

This establishes that A equals B equals C, making D the exception.

Solution:

All other shapes are quadrilaterals, while a hexagon has six sides.

Solution:

Image D

Rotating Shape A by 90 degrees counterclockwise aligns it with Shape B.
Rotating Shape A by 90 degrees clockwise aligns it with Shape C.

This establishes that A equals B equals C, making D the exception.