Can you think of four words in which adding a single letter will change the word into the name of an animal - without any re-arrangement of letters? 

HINT:

The first letters of the words are:

1. B

2. B

3. C

4. R

 

SECOND HINT:

The first two letters of the words are:

1. BA

2. BU

3. CO

4. RA

 

Answers to words:

1. BADGE

2. BURR

3. CONDO

4. RAVE

 

Answers to  animals: 

1. BADGER

2. BURRO

3. CONDOR

4. RAVEN

 

Credit:

Emily Cox and Henry Rathvon