Elephants are a large part of Thailand's tourist business, and the smuggling and mistreatment of elephants for tourist attractions is a widespread practice. Be aware that elephants are often separated from their mothers at a young age to be cruelly trained under captivity for the rest of their lives. If you intend to go on an elephant ride, purchase an elephant painting, or "use" elephants for other activities, please take their mistreatment into account. There are a few ethical animal tourism operators in Thailand such as Elephant Nature Park in Chiang Mai.
A depressingly common sight on the congested streets of Bangkok and other tourist centers is elephant begging. During night hours, mahouts (trainers) with lumbering elephants approach tourists to feed the creatures bananas or take a photo with them for a fee. The elephants are brought to the city to beg in this way because they are out of work and are mistreated and visibly distressed under the conditions of the city. Please avoid supporting this cruelty by rejecting the mahouts as they offer you bananas to feed the elephants.
Drugged animals such as lizards and birds are sometimes used by touts as photo subjects. These touts are often seen plying the main tourist beaches of Thailand. The tout will take a photo with you and the doped up animal and then demand payment.
Rare and endangered species are often sold at markets for pets, and many other animal products are sold as luxury items. Avoid buying rare pets, leather, ivory, talons, dried sea creatures (such as starfish), fur, feathers, teeth, wool, and other products since they are most likely the result of illegal poaching, and buying them contributes greatly to animal endangerment and abuse.