OKAY CLEARLY WORDED THE QUESTION WRONG. I'm talking about human beings feeling little jealousy towards other species. Also, being jealous of their relationships with our own species doesn't count, because that could be construed as envy of humans. Other species' relationships, looks etc.
I am jealous of the three toed sloth. It can complete sexy time in 10 seconds including foreplay. I could have sex 60 times in 10 minutes.