Radiator Leak

I noticed that whenever I start my car a little radiator fluid comes out. Not much but not a little either: somewhere in the middle.

I checked the drain plug and it is nice and tight.

Anythoughts? 97 Escort LX 101K 5speed.

There's a lot more coolant pressure when you first start your engine because the thermostat is closed. That's why it leaks at start-up. Any puddles underneath? I'd check the heater hoses and thermostat housing for starters.