Zoo animals celebrate Valentine's DayPublished14 February 2013Image caption, Love is certainly in the air at Twycross Zoo, in Warwickshire! This wallaby was given a rose as a treat.Image caption, A Marmoset monkey looks at a Valentine's Day card at a Safari Park near Stirling - we think Joe sent it!Image caption, Five-year-old jaguar Nindiri received a romantic lunch - a heart-shaped Valentine's Day treat of frozen beef blood, beef hearts and pieces of meat at the San Diego Zoo, California. Delicious!Image caption, Oh dear - it doesn't look like this penguin had much luck when he tried to give his friend a Valentine's Card in San Francisco, California. Cold shoulder!Image caption, Wonder who this meerkat's secret admirer is? Another tasty looking heart-shaped treat...Image caption, This meerkat's secret admirer went down the traditional route and left a rose.Image caption, This chimpanzee at Whipsnade Zoo received a whole bag of treats in a heart-shaped bag - what a lucky boy!Image caption, These two ring tailed lemurs don't want to let each other go at Bristol Zoo Gardens - all together now: ahhhhhh!