The term 'stingray cousin' refers to two different species of marine animals. The first is the MANTA, which is a large ray with a wingspan of up to 7 meters and is found in tropical and subtropical waters around the world. The second is the SKATE, which is a smaller ray that can grow up to 1.5 meters in length and is found in temperate and subtropical waters. Both species are related to stingrays, but have evolved differently over time.