I have to tell you what humans are doing that are endangering animals. Since humans are cutting down thousands of trees, forests, and jungles, animals have no place to live or reproduce. Their predators can easily spot them, and plants are also food to some animals, cutting down trees will effect the whole food chain. For example, if we cut down some trees, and the grass around it, rabbits in that environment will not get their food that they need. Some die of hunger, eating unhealthy things, and killed by foxes. Then rabbits don't reproduce that much, and the fox will die, and whatever eats the fox will not get food.
Two
As for birds, air pollution from cars, factories, and power plants play a big roll in killing animals. More and more cars, goods, and electric supply are needed by the people of earth. The air pollution doesn't let the birds breathe, and the die.
Three
In addition to air pollution, acid rain kills underwater fish and animals, it also kills birds, trees, and car paint. Acid rain is formed when SOx and NOx go into the clouds, and mixes with the rain, and falls down. This is a water pollution. Another water pollution is more people, more oil. There can be oil leaks, and spills. This makes the fish hard to breathe, and kills them.
Who's effected
Other animals that eat and depend on other animals