Connections Hint Today Wed, Jan 1 #603

Need help with Connections puzzle #603 on Wed, Jan 1? Get your daily connections hint today! Find the hidden links between these 16 words: EARTHWORM, EEL, SALAMANDER, SLUG, AURORA, FIREFLY, GLOWSTICK, RADIUM, CANAL, CLOG, TULIP, WINDMILL, GATECRASH, RAINDROP, SKYDIVE, WATERFALL