I enjoyed this place because there were a lot of trees and a lot of birds with colourful wings.

wings 是 wing 的复数形式，wing 的意思是"翅膀"，指鸟类或昆虫用于飞行的器官。colourful wings 指"色彩斑斓的翅膀"，形容鸟类翅膀颜色鲜艳多样。