Nature Vancouver/Marine Biology presents a free lecture titled Dining By Moonlight: Tidal and Lunar Links to Harbour Porpoise Foraging Behaviours. Prof. Anna Hall leads the April 11 lecture at the Unity Church, 5480 Oak St. It's at 7: 30 p.m. For more information, go to www.naturevancouver. ca/marinebiology or call 604-737-3074. Free parking is available.