Here's why:
* Short vowel sounds are typically quick and sharp. The "i" in "spider" is pronounced with a short, quick sound, like the "i" in "bit" or "pig".
* Long vowel sounds are typically drawn out and can sometimes be pronounced the same as the letter itself. For example, the "i" in "bike" is a long vowel sound.
Let me know if you have any other words you'd like to analyze!