Why is Euglena is called plant-animal?

Euglena is called plant-animal because it has characteristics of both plants and animals. Like plants, Euglena has chloroplasts with the help of which it performs autotrophic nutrition by photosynthesis. Like animals, it lacks cell wall, possess pellicle, an anterior invagination” flagellum, eye spot, etc, and capable of obtaining readymade food in dark (heterotrophic).