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How people and animals start living
Where eggs grow
The sperm and how it finds the egg
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animals are born animals begin animals mate animals start living animals take babies are born become alive begin growing begin our lives begin their lives bigger birth boys and girls build their nests calf call the uterus chickadees cord or tube dogs egg grows egg start growing elephant finds the egg finished growing fish spawn four-footed animals giraffe grow from eggs grown horse human babies join the egg keep on growing leave the uterus lion little tube lives as eggs living sperm male bird mammals menstruation milt mother bird mother's body mother's milk navel nest we call ovary penis picture placenta puppies ready for mating salmon scrotum semen send the sperm silky flycatcher small-mouthed black bass soon sperm go sperm have left sperm joins sperm start swimming sperm to join story tail feathers takes to grow trout is halfway University of California whales woman zoology