阅读短文，根据短文内容回答问题。
A heavy rain hits Chongqing one day and makes the river rise. When the rain stops, people there see a dog called Huahua swim across the river to an island(岛屿) 3 times a day for 2 weeks.Why? Her four children are on the island. She swims every day to milk her babies.
Animals show love the same way people do, and Huahua is not the only example. British scientiest Jane Goodall spends 14 years living with chimpanzees(大猩猩) in Africa. She finds that chimpanzees care for each other when others get hurt(伤害) or lose their parents. “It is not only humans(人类) who are clever and responsible( 有责任心 ) , animals also are,” she says.
Two birds in Chengdu show parental love when their child is hurt and falls on the street in the center of the city. Cars keep driving past but the brave parents run fast down to the road and get the little bird away.
Animals not only love their own children but also care for other animal babies.  A British newspaper says a chimpanzee namned Anjanan in an animal center takes care of a baby lion. She milks the lion carefully every day. “They are just like mother and son,” a worker of the center says.
How many children has the dog Huahua got?
Do chimpanzees care for each other like humans?
What do “the brave parents” do?
How does Anjana take care of the baby lion?
What can we learn from the passage?