Hide and Seek

This is a true story, but it's not a supernatural horror. When I was young, I played hide-and-seek with my friends. I was the one hiding, so I thought I'd hide in the bushes? low shrubs? in the corner of the park. As I was about to go in without thinking, I was surprised to see a huge spider, about the size of my fist, mostly black but with colorful, mottled patterns. Afterwards, I went home and searched on my smartphone and looked through the spider section of encyclopedias, but I couldn't find any spiders that looked exactly the same. A few days later, out of curiosity, I went to the same spot, but even the spider's web was gone. ...What was that?