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Despite the great biodiversity in the Arachnida, some taxa are still now poorly known, mainly in terms of biology, ecology, and behavior. Pseudoscorpions are small arachnids (2–8 mm) that live in cryptic environments, being in general solitary predators of other invertebrates. The most studied...
Distinctiveness of chicks’ calls may arise in ontogenesis when parents can confuse their own and alien chicks, leaving their nests and forming crèches or flocks. It is unknown, however, whether the individual vocal signature retains further in ontogenesis or relaxes when the necessity in the...
Killer whale discrete calls include types containing an overlapping high-frequency component (biphonic calls) and types without an overlapping high-frequency component (monophonic calls). In the resident killer whales of the Northeast Pacific, biphonic discrete calls exhibit higher source levels...
Convict cichlids (Archocentrus nigrofasciatus) are a territorial, monogamous, and biparental Central American cichlid fish. Convicts exist in two common color morphs: the wild-type (WT) black-barred form and an amelanistic (AM) barless morph. Color morphs affect aggressive interactions in other...
In asexual all-female species, such as the Amazon molly, Poecilia formosa, that depend on sperm from “host males” only to trigger embryogenesis, mate choice does not provide any indirect, genetic benefits to the choosing female, although direct benefits are possible. Asexual species are thought...
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