Zoo Animal Portrait by Dimitrios Kelepouris. A goat at the Philadelphia Zoo feels the friendly touch of one of the visitors on Wednesday, April 19, 2017. Hamilton Exhibit by Siena Sohn. A goat enjoys the attention of children brushing and petting him in the Hamilton Exhibit on Saturday, April 15, 2017. Free Selection by Diana Shalenkova. Two sloth bears fight it out at the Philadelphia Zoo on April 15, 2017.