The document discusses several endangered species, including humpback whales that are 10-30 feet long and were listed as endangered in 1970 but have started recovering due to a ban on commercial whaling in 1964. The addax antelope found only in North Africa is one of the most endangered species due to desertification and overhunting. The population of golden arrow poison frogs in Panama has declined 80% in the last 10 years primarily due to a fungal disease, and they are also threatened by being kept as pets. There are less than 3,000 remaining pygmy hippos that live in West Africa and are nearly extinct due to logging and agricultural expansion.