Tony Wu / Humpback whale (Megaptera novaeangliae) adult female at rest. The tubercles on the whale's head are clearly visible, as are the barnacles (Coronula diadema), whale lice (Cyamus boopis), and hairs on t...
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Tony Wu / Humpback whale (Megaptera novaeangliae) large male spyhopping in the early morning, Vava'u, Tonga, South Pacific The single hairs in the whale's tubercles are visible, as are hairs on the front of the...
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Chien Lee / Curved Spiny Spider (Gasteracantha arcuata) showing unusual tubercles with unknown function, Lambir Hills National Park, Borneo, Malaysia
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Chien Lee / Curved Spiny Spider (Gasteracantha arcuata) with unusual tubercles with unknown function, Lambir Hills National Park, Borneo, Malaysia
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Joel Sartore / Photo Ark / Bigmouth chub (Nocomis platyrhynchus) looking around, Aquatic Wildlife Conservation Center, Marion, Virginia. Captive.
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Joel Sartore / Photo Ark / Tricolor shiner (Cyprinella trichroistia) male with nuptial tubercles, Goodwater, Alabama. Captive.
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Brian Bevan / Minnow (Phoxinus phoxinus) group of breeding males showing tubercles, Bedfordshire, UK, May.
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Brian Bevan / Minnow (Phoxinus phoxinus) breeding male showing tubercles, Bedfordshire, UK, May.
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David Fleetham / Humpback whale (Megaptera novaeangliae) surfacing, Hawaii.
