1. What pattern do you see in the names of these five animals?

CAT

HORSE

ELEPHANT

CROCODILE

HIPPOPOTAMUS

2. What is the next name in this list?

CHARLES

DION

STUART

KEVIN

JOSHUA

SERGIO

???????? - JEREMY, SHAUN, THOMAS, DUANE, RUPERT, ULYSSES

HINTS:

1 and 2: It has to do with vowels.

Answers:

1. The number of vowels increases by one in each word.

2. DUANE - The vowels in each name are listed in repeating AEIOU order.