Most animals have tails - people and apes don't. A tail is just an extension of the animal's backbone. Animals use their tails to communicate - dogs wag their tails when they are happy, cats wave their tails when they are angry and put their tails straight up to say "hello". Animals like cows and horses use their tails to swat flies away. The kangaroo has a big, heavy tail that it uses to balance itself when it hops.
When you are very sad or upset, you cry. When you cry, tears come out of your eyes. If you taste your tears, they are salty.
Teat is another word for nipple, particularly on a female animal with babies. Teats are where milk comes from, to feed baby animals.
Tentacles are long, flexible parts of some animals that are used for reaching, moving and for collecting food. Octopus, squid and anemones all have tentacles.
You have five toes on each foot. Toes help you to walk and run. If you stand on your toes, you are taller and you can see more.