Tony Wu / Sperm whale (Physeter macrocephalus) nostril. This species have a single blowhole on the left side of their heads. The other nostril has been modified into an internal organ called the phonic lip that...
Mark Carwardine / Sperm whales (Physeter macrocephalus) aerial shot showing much larger male on right, with female nursery group. Baja California, Mexico
Mark Carwardine / RF Sperm whales (Physeter macrocephalus) female group, aerial view. Baja California, Mexico (This image may be licensed either as rights managed or royalty free.)