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A Mexican bluewing butterfly (Myscelia ethusa ethusa) at the Gladys Porter Zoo in Brownsville, Texas.

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A great southern white butterfly (Ascia monuste) at the Gladys Porter Zoo in Brownsville, Texas.

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A great southern white butterfly (Ascia monuste) at the Gladys Porter Zoo in Brownsville, Texas.

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A gulf fritillary butterfly (Agraulis vanillae incarnata) at the Gladys Porter Zoo in Brownsville, Texas.

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A gulf fritillary butterfly (Agraulis vanillae incarnata) at the Gladys Porter Zoo in Brownsville, Texas.

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BIR032-00460

A male ringed teal (Callonetta leucophrys) at the Gladys Porter Zoo in Brownsville, Texas.

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A male ringed teal (Callonetta leucophrys) at the Gladys Porter Zoo in Brownsville, Texas.

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A male ringed teal (Callonetta leucophrys) at the Gladys Porter Zoo in Brownsville, Texas.

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A southern crested caracara (Caracara plancus) at the Gladys Porter Zoo in Brownsville, Texas.

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A southern crested caracara (Caracara plancus) at the Gladys Porter Zoo in Brownsville, Texas.

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A southern crested caracara (Caracara plancus) at the Gladys Porter Zoo in Brownsville, Texas.

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A Hoffmann’s two-toed sloth (Choloepus hoffmanni florenciae) at the Gladys Porter Zoo in Brownsville, Texas.

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A brown pelican (Pelecanus occidentalis) at the Gladys Porter Zoo in Brownsville, Texas.

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A brown pelican (Pelecanus occidentalis) at the Gladys Porter Zoo in Brownsville, Texas.

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A brown pelican (Pelecanus occidentalis) at the Gladys Porter Zoo in Brownsville, Texas.

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A Mexican burrowing toad (Rhinophrynus dorsalis) at the Gladys Porter Zoo in Brownsville, Texas.

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A Mexican burrowing toad (Rhinophrynus dorsalis) at the Gladys Porter Zoo in Brownsville, Texas.

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A juvenile Cuvier’s dwarf caiman (Paleosuchus palpebrosus) at the Gladys Porter Zoo in Brownsville, Texas.

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A juvenile Cuvier’s dwarf caiman (Paleosuchus palpebrosus) at the Gladys Porter Zoo in Brownsville, Texas.

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A Cuvier’s dwarf caiman (Paleosuchus palpebrosus) at the Gladys Porter Zoo in Brownsville, Texas.

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An endangered (IUCN) and federally endangered aquatic box turtle (Terrapene coahuila) hatchling at the Gladys Porter Zoo in Brownsville, Texas.

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An endangered (IUCN) and federally endangered aquatic box turtle (Terrapene coahuila) hatchling at the Gladys Porter Zoo in Brownsville, Texas.

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A Texas blind snake (Leptotyphlops dulcis) at the Gladys Porter Zoo in Brownsville, Texas.

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A Texas blind snake (Leptotyphlops dulcis) at the Gladys Porter Zoo in Brownsville, Texas.

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A Mexican milksnake (Lampropeltis triangulum annulata) at the Gladys Porter Zoo in Brownsville, Texas.

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A Mexican milksnake (Lampropeltis triangulum annulata) at the Gladys Porter Zoo in Brownsville, Texas.

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A Jerdon’s pitviper (Trimeresurus jerdonii) at the Gladys Porter Zoo in Brownsville, Texas.

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A Jerdon’s pitviper (Trimeresurus jerdonii) at the Gladys Porter Zoo in Brownsville, Texas.

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A reticulate gila monster (Heloderma suspectum suspectum) at the Gladys Porter Zoo in Brownsville, Texas.

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A Texas alligator lizard (Gerrhonotus infernalis) at the Gladys Porter Zoo in Brownsville, Texas.

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A Texas alligator lizard (Gerrhonotus infernalis) at the Gladys Porter Zoo in Brownsville, Texas.

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A Mexican beaded lizard (Heloderma horridum horridum) at the Gladys Porter Zoo in Brownsville, Texas.

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A Mexican beaded lizard (Heloderma horridum horridum) at the Gladys Porter Zoo in Brownsville, Texas.

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A reticulate gila monster (Heloderma suspectum suspectum) at the Gladys Porter Zoo in Brownsville, Texas.

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A reticulate gila monster (Heloderma suspectum suspectum) at the Gladys Porter Zoo in Brownsville, Texas.

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A red tegu lizard (Tupinambis rufescens) at the Gladys Porter Zoo in Brownsville, Texas.

Photo: Julie Jensen Director of Marketing | WVC O: 866.800.7326 | D: 702.443.9249 | E: j.jensen@wvc.org

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