Vomeronasal organs were known to occur in many animals but not in humans.
Territorial behaviour occurs in many animals and is especially widespread in mammals.
Examples of hemoproteins are the green, photosynthetic chlorophylls of higher plants; the hemoglobins in the blood of many animals; the cytochromes, enzymes that occur in minute quantities in most cells and are involved in oxidative processes; and catalase, also a widely distributed enzyme that accelerates the breakdown of hydrogen peroxide.
Although asexual reproduction is found in many animals, it doesn't ever occur naturally in mammals.
A striking degree of hemosiderosis of the red pulp, along with mineralization of the capsule and trabeculae, occurred in many animals, including uninfected controls, and appeared to be a normal, age-related phenomenon in this species.
However, less well-understood changes also occur in many animals during reproduction; internal organs, such as the liver, pancreas, and gastrointestinal tract, increase their size and adapt their physiology, potentially contributing to an increased generation and delivery of nutrients (Hammond, 1997; Speakman, 2008).
Duplication of mt genes or the control region occurred in many animals, including snakes (Kumazawa et al. 1998), birds (Eberhard et al. 2001), thrips (Shao and Barker 2003), ticks (Shao et al. 2005a), mites (Shao et al. 2005b), and geckos (Fujita et al. 2007).
Although lumps can occur at injection sites in many animals, progression to a highly invasive sarcoma appears to occur only in cats.
Campylobacter occurs naturally in the guts of many animals.
Orthopedic conditions are occurring in younger and younger pets, and with greater severity, because so many animals are overweight.
