There are various interesting animals in our world - from the weirdest to the most beautiful, from the most elegant to the cutest, from the wildest to the sweetest - some are rarely seen, others are living with us, like dogs, cats, hamsters, budgies, etc., or rabbits, birds, horses, cows, llamas, goats, sheep, etc. Who doesn't love to see them move, rest, work or play - even if it is in a documentation or a movie?
I cannot say which is the most interesting animal, as all are fascinating ...