Recently I purchased a macro photography extension tube. I attached it to my 55-300 ml lens using my Nikon D3300 HDSLR, and it let me get these shots.
Extension tubes increase your lens length and lets you get closer to the thing you are taking a picture of. An extension tube fits between your lens and your camera mount. It moves your lens further from the camera. The closer you can focus, the more magnification you get. I used the Fotodiox Nikon Macro Extension Tube Kit for Nikon cameras, Extreme Close-ups. I bought this on Amazon for around $14.