Take a list of words and classify them into two groups
Crab, Tiger, Bear, Elephant
Group 1 - Aquatic Animals: Crab

Group 2 - Terrestrial Animals: Tiger, Bear, Elephant
Complete the following task based on the instruction and optional input provided.### Instruction:
Take a list of words and classify them into two groups

### Input:
Crab, Tiger, Bear, Elephant

### Output:
Group 1 - Aquatic Animals: Crab

Group 2 - Terrestrial Animals: Tiger, Bear, Elephant