You Otter Be Onboard - Budjarn Lambeth, Lithgow World Otter day is an international event held on the 30th of May which is organised by the International Otter Survival Fund (IOSF). The idea is to raise awareness and funding for otter conservation. 12 out of 13 otter species around the world are threatened, so the IOSF helps people hold events to raise funds and awareness. Read Story