The endangered antelope species mentioned in the crossword solutions are the ELAND (5 letters) and the ORYX (4 letters). The ELAND is the largest antelope in the world, native to the savannas of East and Southern Africa. It is a herbivore and is known for its long horns and striking coat pattern. The ORYX is a large antelope native to Africa and the Arabian Peninsula. It is characterized by its long, straight horns and white fur with dark markings. Both species are considered endangered due to habitat loss and hunting.