Virginia Opossum (Didelphis virginiana) The opossum is an introduced species which has done very well in San Diego County and is now considered to be a permanent resident. It was first introduced in 1890 by a ‘possum lover in Los Angeles and has subsequently spread from Canada to Baja California. Breeding takes place in January and February, and the young are born 13 days after copulation. The babies are born and crawl across the mother’s stomach into a pouch where they spend the next two months firmly attached to the nipples. By the time they are 100 days old, they are ready to fend for themselves and leave the mother to begin a rather solitary existence. They eat almost everything and appear to do very well in close proximity to human habitations and can be expected to be found in all parts of the Reserve.

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