Mistake #1: Not Knowing the Difference between 'tortoise' and 'turtle'

In the grand tradition of confusing reptiles, we bring you Mistake #1: Not understanding the difference between 'tortoise' and 'turtle'.
Learn about the tortoise or Learn about the turtle

Symptoms:

- Frequently confusing the two in casual conversation

- Accidentally using both in a sentence in the same sentence

Consequences:

- Social isolation due to constant correction from herpetologists

- Loss of credibility in the eyes of your peers

Next Mistake: Mistake #2: Using 'disembarkation' instead of 'disembark'