Many have heard of this unique egg-laying mammal, but even in Australia, few have managed to spot one. They are nocturnal, spending time in burrows during the day and most of their time in the water foraging at night. They are rare in zoos, as well, with only 20 in Australian zoos as of 2019—plus 2 in San Diego, the only ones found outside of their native land. Bob Wiese, Ph.D., chief life sciences officer for SDZG, said that "We began working with our partners in Australia eight years ago, to develop the policies and parameters necessary for a successful platypus overseas move. We are honored to be entrusted with these extraordinary animals."