What is an otter??

Last Monday I asked this to my brother and he demonstrate and imitate to me what otter is but I still don't know what it is.. I wait until my sister came back then I asked them again... First, my sister don't know what I meant.. But when my brother show imitate otter's action then she know already... Even my mom and dad also know what is it... Whole family also know what otter is but I still don't know.. Haha.. But today I already know what otter is... I go to yahoo image search and I know what otter is already.. Wahaha... Funny leh... I also laugh at myself whole day.. Everybody in my family also laugh at me for not knowing what otter is.. It is not shame on myself.. I ask because I don't know ma... But it is a good laughter la.. ^^ It brighten my day.. Hehe.. ^^