The always colorful males light up with biofluorescence, sending off signals. A male Paradisaea rubra, or red bird-of-paradise.Credit...Rene Martin/American Museum of Natural History Supported by By ...
Sperm Storage Tubules (SSTs) allow female ducks to store sperm for extended periods, decoupling insemination from fertilization and enabling delayed fertilization. Female ducks have more control over ...
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