rtbilder // Shutterstock As the duckling in Dr. Seuss' "Are You My Mother?" knows all too well, cross-species animal adoption is rare. It has occurred, though, in limited animal groups spanning mostly mammals and birds. Such occurrences have captured .
rtbilder // Shutterstock As the duckling in Dr. Seuss' "Are You My Mother?" knows all too well, cross-species animal adoption is rare. It has occurred, though, in limited animal groups spanning mostly mammals and birds. Such occurrences have captured .