Hi i have two Campbell ducklings they are nearly 4 week old so not living outside yet. Any ideas on what sex they are? The yellow one is bigger and has a quackier squeak the brown one is smaller is squeakier and follows the yellow one around constantly and its 100% more scared than the yellow one. Today the brown one hissed at me when I went to get it out for a splash in the bath. (They love love the bath) any ideas?