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Verano 2025
Vol. 17 No. 191 (2025)The cover page
The monarch butterfly (Danaus plexippus) is a species of lepidopteran native to the American continent, known for its complex and extensive annual migration. Each year, it travels more than 4,000 km from the northern United States and southern Canada to central Mexico forests, where it hibernates. Its characteristic orange and black colors not only make it easily identifiable, but also serve a defensive function by scaring off potential predators. Although native to the Americas, the monarch butterfly was introduced in the 19th century to Australia and New Zealand, where this photograph was taken (Hamilton). As with many species of lepidoptera, the monarch faces threats from habitat loss and climate change, making it urgent to promote conservation actions for this and other species.
Rubén Fernández Santamaría
rubenfernandezsantamaria@gmail.com
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Primavera 2025
Vol. 27 No. 190 (2025)The cover
The genera Anomalocaris, Hallucigenia and Xianguangia belonged to the Cambrian period, when the first predators appeared in the fossil record. Anomalocaris had spiny appendages on its head with which it carried food to its mouth, which was shaped like a pineapple slice, and teeth to crush it. It could measure up to one meter. Hallucigenia was no more than a few centimeters long and had a long body with spines on the dorsal side and soft-tissue limbs on the ventral side. Xianguangia was a sessile organism. It had a cylindrical body with numerous feather-like tentacles around an oral disc, adapted for filter feeding.
Naia Salas Vega
naiasv03@gmail.com
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Verano 2024
Vol. 16 No. 187 (2024)On the cover
The African savannah elephant (Loxodonta africana) is considered endangered due to the alarming decline of its populations in the wild. In this issue, Conrado González Ferreira discusses how poaching for ivory is such a selection pressure that it is causing the decline of those genotypes that code for large tusks. The cover photo was taken by this author in Chobe National Park in the Republic of Botswana.
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