An acorn is a nut, which is, of course, a type of fruit, and so, it is correct to state that the fruit or nut of an oak tree is known as an acorn. It is also the case that not all acorns are the same. There are around five hundred species of oak in existence and so there's a lot of room for variation in terms of color, size, and shape. That said, there are two predominant species of oak which grow in the area around Kennedy Meadows and they are the California Black Oak (Quercus kelloggii) and the Canyon Live Oak (Quercus chrysolepis). This video features both species of oak. It should be noted that while the Canyon Live Oak is evergreen, the California Black Oak is distinctly deciduous. Or, put another way, not all oaks adhere to the same life-style!