Here are my nephew's two speeches for his competition.Please check it and which one is better?Thanks

Hello,everyone. My nephew will have an English speech competition. Here are my nephew's two speeches for his competition, please help me check and correct it, then tell me which one is better than the other one ? Thank you very much.
1、The first one
Today my topic is "Animal". Do you like animals?Yes, I do. I believe nearly everybody have themself favourite animals. Some of people like dogs, because they can help us. Someone likes rabbits, because they're cute. Do you know what my favorite animal is? It is one of the most precious animals. They live in the ocean and good at swimming. They are very cute and beautiful. Not only swim fast, but also smart. Most of their color is gray, only a small number of it are white. Though they look like fish, they are mammals. Also they can be trained by people due to their high IQ. They learn things very quickly and do all the actions accurate. They are very friendly.Can you guess its name now? Yes, you are right. They are dolphins.
However, as we all known, the number of dolphins is getting smaller and smaller. Because of water pollution, there is less and less space for dolphins. Many people make money by hunting dolphins. if we don't protect them, maybe well lose our good friends some day. As a student, I hope more and more people should protect dolphins. I love dolphins very much. and I hope dolphins are our good friends forever. I hope they can live in the blue sea happily and peacefully. Let's protect the animals together. Let's take actions now.
2、The second one
Today my topic is" Birthday" .Many people are celebrate birthday all over the world.Because birthday is one of the most important days in their lives.On April 20th is my birthday, I always have happy feelings on my birthday.Because many people, including my family and friends, had congratulated on me! Every year, they all came to my small party I had for my birthday, brought me birthday presents and said happy birthday to me. Sometimes the gifts surprised me very much. My mother always made birthday cake and cooked some delicious food for us on my birthday. Then my friends helped me put the candles on the big cake. Every time I always made three birthday wishes. We ate together, sang together ,danced together and played funny games together. We were very happy to be together. Oh, I still remember last birthday I got a funny name "magic boy", because I showed a magic to them, they all felt very magical. Do you want to see this magic, well ,next time I will show to you

The first essay is better than the second.

Here are my nephew's two speeches for his competition. Please check it them and determine which one is better. Thanks.

Hello,everyone. My nephew will have an English speech competition. Here are my nephew's two speeches for his competition, please help me check and correct it them, then tell me which one is better. than the other one ? Thank you very much.
1、The first one
Today my topic is "Animals". Do you like animals? Nearly everybody likes animals. Some of people like dogs because they can help us. Someone likes rabbits because they're cute. Do you know what my favorite animal is? It is one of the most precious animals. They live in the ocean and are good at swimming. They are very cute and beautiful. They not only swim fast but are also smart. Most of their its color is gray, only a small number of it is are white. Though they look like fish, they are mammals. Because of their high IQ, dolphins  they (it is not a grammatical error to use "dolphins" but he asks "Can you guess its name now?" in the next few sentences so he shouldn't reveal the animal just yet) can be trained by people. They can learn things very quickly and do all the actions accurately. They are very friendly. Can you guess its name now? Yes, you are right. They are dolphins.
However, as we all known, the number of dolphins is getting smaller and smaller. Because of water pollution, there is less and less space for dolphins. Many people make money by hunting dolphins. If we don't protect them, maybe we'll lose our good friends some day. As a student, I hope more and more people should protect dolphins. I love dolphins very much, and I hope dolphins are our good friends forever. I hope they can live in the blue sea happily and peacefully. Let's protect the animals together. Let's take actions now.
2、The second one
Today my topic is" Birthdays" .Many people are celebrate birthdays all over the world because birthdays is are one of the most important days in their lives. On April 20th, is my birthday, I always have happy feelings on my birthday.B because many people, including my family and friends, had congratulated on wish me well! Every year, they all came to my small party I had for my birthday, brought me birthday presents, and said happy birthday to me. Sometimes the gifts surprised me very much. My mother always made birthday cake and cooked some delicious food for us on my birthday. Then, my friends helped me put the candles on the big cake. Every time I always made three birthday wishes. We ate together, sang together ,danced together and played funny games together. We were very happy to be together. Oh, I still remember that last birthday I got a funny name, "magic boy", because I showed a magic to them. They all felt very magical. Do you want to see this magic? Well, next time I will show it to you.

I personally like the "Animals" one better.