two animals images - Joel Sartore

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INV006-00482

Two pond slaters (Asellus aquaticus) at Alpenzoo Innsbruck in Innsbruck, Austria. Shown is a female atop a male.

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INV006-00481

Two pond slaters (Asellus aquaticus) at Alpenzoo Innsbruck in Innsbruck, Austria. Shown is a female atop a male.

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FIS039-00462

Two Bornean chili rasbora (Boraras brigittae) at the Prigen Conservation Breeding Ark in Indonesia.

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ANI113-00380

Two striped spiny reed frogs (Afrixalus dorsalis) at Prague Zoo in Prague, Czech Republic.

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ANI113-00377

Two Western spadefoot toads (Spea hammondii hammondii) from Corral Hollow near Livermore, California. Shown are an adult and juvenile.

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ANI113-00375

Two Western spadefoot toads (Spea hammondii hammondii) from Corral Hollow near Livermore, California. Shown are an adult and juvenile.

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FIS039-00457

A male and female Wallace Road rainbowfish (Melanotaenia sp. Wallace Road) from a private collection. The male is larger than the female.

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FIS039-00456

A male and female Wallace Road rainbowfish (Melanotaenia sp. Wallace Road) from a private collection. The male is larger than the female.

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FIS039-00453

A male and female crimson-spotted rainbowfish (Melanotaenia duboulayi) from a private collection. The male is larger and more colorful.

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FIS039-00452

A male and female crimson-spotted rainbowfish (Melanotaenia duboulayi) from a private collection. The male is larger and more colorful.

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FIS035-00034

A male and female Indian neon highfin barb (Oreichthys crenuchoides) from a private collection. The male has a longer dorsal fin.

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FIS035-00033

A male and female Indian neon highfin barb (Oreichthys crenuchoides) from a private collection. The male has a longer dorsal fin.

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FIS035-00032

A male and female rosy barb (Pethia conchonius) from a private collection. The male is smaller and red while the female is larger and a gold color.

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FIS035-00031

A male and female rosy barb (Pethia conchonius) from a private collection. The male is smaller and red while the female is larger and a gold color.

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FIS035-00030

A male and female Golden barb (Pethia gelius) from a private collection. The male has more red color than the female.

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FIS035-00029

A male and female Golden barb (Pethia gelius) from a private collection. The male has more red color than the female.

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FIS035-00028

A male and female melon barb (Haludaria fasciata) from a private collection. The male is larger with tubercles on its nose.

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FIS035-00027

A male and female melon barb (Haludaria fasciata) from a private collection. The male is larger with tubercles on its nose.

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FIS035-00026

A male and female melon barb (Haludaria fasciata) from a private collection. The male is larger with tubercles on its nose.

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FIS032-00044

A male and female leopard splitfin (Xenotaenia resolanae) from a private collection. The female is larger while the male often has yellow tail margins. This species is listed as vulnerable by IUCN.

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FIS032-00043

A male and female leopard splitfin (Xenotaenia resolanae) from a private collection. The female is larger while the male often has yellow tail margins. This species is listed as vulnerable by IUCN.

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FIS032-00042

A male and female critically endangered San Marcos redtail splitfin (Xenotoca doadrioi) from a private collection. The male is more colorful than the female.

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FIS032-00040

A male and female critically endangered San Marcos redtail splitfin (Xenotoca doadrioi) from a private collection. The male is more colorful than the female.

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FIS032-00039

A male and female Tarascan splitfin (Zoogoneticus purhepechus) from a private collection. The male is smaller with red stripes on fins. This species is listed as vulnerable by IUCN.

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FIS032-00038

A male and female Tarascan splitfin (Zoogoneticus purhepechus) from a private collection. The male is smaller with red stripes on fins. This species is listed as vulnerable by IUCN.

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FIS032-00037

A male and female Cuitzeo jeweled splitfin (Xenotoca sp. Cuitzeo) from a private collection. The male has a yellow stripe on the tail.

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FIS032-00036

A male and female Cuitzeo jeweled splitfin (Xenotoca sp. Cuitzeo) from a private collection. The male has a yellow stripe on the tail.

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FIS017-00245

Two corydoras (Corydoras sp. (CW 26)) from a private collection.

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FIS017-00243

Two corydoras (Corydoras sp. (CW 26)) from a private collection.

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FIS025-00079

Two female, federally endangered Northern tidewater goby (Eucyclogobius newberryi) from Vandenberg Space Force Base in California.

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FIS025-00078

Two female, federally endangered Northern tidewater goby (Eucyclogobius newberryi) from Vandenberg Space Force Base in California.

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INV004-00330

Two plain cactus snails (Xerarionta intercisa) at the Wilson Cove Field Station on San Clemente Island, California. This species is listed as vulnerable by IUCN.

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INV004-00329

Two plain cactus snails (Xerarionta intercisa) at the Wilson Cove Field Station on San Clemente Island, California. This species is listed as vulnerable by IUCN.