Astragalus and calcaneum are found in

Options

A. fore limb of frog
B. hind limb of frog
C. wing of bird
D. skull of rabbit.

Answer

### Step-by-Step Solution:

1. **Identify the Bones**: The question asks about the bones "astragalus" and "calcaneum". These are specific bones found in certain animals.

2. **Understand the Context**: Astragalus and calcaneum are known as crurotarsal bones. They play a role in the skeletal structure of certain animals.

3. **Determine the Animal Group**: The bones in question are associated with amphibians, particularly frogs, which have adaptations for both aquatic and terrestrial life.

4. **Locate the Bones**: In frogs, the astragalus and calcaneum are found in the hind limb, which is adapted for jumping and swimming.

5. **Eliminate Other Options**: The question provides multiple choices: forelimb of the frog, hindlimb of the frog, wing of the bird, or skull of the rabbit. Based on the knowledge that these bones are part of the hind limb, we can eliminate the other options.

6. **Conclude the Answer**: Therefore, the correct answer is that the astragalus and calcaneum are found in the **hind limb of the frog**.