Embryonic development takes place rapidly. It is also a key area of study during drug safety testing. This photo shows thirty-day-old zebrafish embryos. Because they are transparent, researchers can easily monitor the development of the embryo from fertilization to when it hatches as larval fish. The embryo in the middle…

Zebrafish larvae are raised from eggs to eventually become breeding adult fish that provide embryos for research studies. The transparent bodies of these young fish allow for non-invasive assessment of organ and tissue changes, something that is not possible with mammals. Their transparency is very helpful when conducting safety and…

Zebrafish embryos are transparent and they also develop quickly. These particular embryos are shown twenty-four hours after fertilization. Each week, a breeding pair of adult zebrafish generate hundreds of embryos that can be used to study the safety and efficacy of new medications. The use of these embryos has helped…

A zebrafish larva is an immature form of an adult fish. In this photo, you see a seven-day-old zebrafish larvae, around the size of a quarter, swimming in water. Approximately twelve larvae live in each small test well. Test substances, such as potential new medications, are dissolved in the water…

Love, Care, Progress: Research Involving Dogs is the inaugural video in the Love, Care, Progress series, focused on the important role of canines in health research which benefits humans and dogs alike. Research professionals, including a trainer, scientist, animal behaviorist, surgical manager, and veterinarian talk about caring for the animals…

A rhesus macaque mom climbs into a hammock with her infant at the Wisconsin National Primate Research Center. Females reach puberty at around age three, while males are sexually mature by age four. Gestation is five and a half months, with one infant born at a time and often a year or…