They are known to stop Horton from talking to a deck speck assuming he is nuts. So they took action to get him some help by taking the flower away from him. Later, Jane the Sour Kangaroo gets word from Vlad Vladikoff that Horton was in the flowers looking for the flower he "Vlad" dropped to mix with the others so the Sour Kangaroo calls the Wickersham brothers who get assistance from their cousins, uncles, aunts, sisters and more brothers and in laws to stop Horton who later finds the flower he lost. After they tormented and beaten him try tried to put him in a cage minutes later after the "Yopp" sound, they all stopped what they were doing realizing Horton was right all along about whos on a small flower.
Suessical 2005 Tv Special
In The Tv Special, The Wickershams Are Orange, Blue & Purple, Voiced By Rob Lowe, Bd Wong, & Zachory Levi
Characteristics Of Adult Simba, Li Sang, & Flynn Rider
Rob Lowe, Bd Wong, & Zachory Levi Are The Same Voices Of Them
The Wickershams Are Described Tough, Strong, & Agressive
They Also Have The Designs Of Adult Simba, Li Sang, & Flynn Rider
In the film, the leader is Yummo Wickersham.
Outside of Dr. Seuss series
One Whickersham from The Wubbulous World of Dr. Seuss has made strange appearances on a couple of Sesame Street media including the NasCount sketch on the "The Amazing Alphabet Race" episode in Season 38 and on the Healthy Habbits for Life video Happy Healthy Monsters.