Give an example of asymmetrical animals?
Butterflies.
Many animals are more or less symmetrical, with exceptions like
crabs and lobsters which have one much larger claw, and some
animals like flatfish which have evolved from a symmetrical
ancestor in such a way as to favour one side only.
Among humans, asymmetrical bodies or features are perceived as
uglier, or as deformed, so there may be strong selection pressures
to choose a more symmetrical mate.
Animals which are super-symmetrical include peacocks,
butterflies and patterned mammals such as tigers, leopards and
ocelots. The last three are particularly symmetrical in their
facial markings, which suggests that it gives a selection
advantage.