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* Secretions from the female reproductive tract that serve to sexually stimulate and attract males to the female. ...the male then secretions of females not in [[Oestrus Behaviour - Anatomy & Physiology|Oestrus]].

...extent of cellular growth and division and the [[Implantation - Anatomy & Physiology|timing]] of implantation varies between species. ...cell type. As the embryo progresses and enters [[Gastrulation - Anatomy & Physiology|gastrulation]] cells become '''pluripotent''', meaning they can form severa

...all reptiles are covered by a protective layer of dry skin with almost no glands. The epidermis is raised to form scales or scutes. This prevents excessiv ...op fully before hatching. The yolked egg is surrounded by protective extra-embryonic membranes (the amnion and allantois), serving for respiration and

...r - Anatomy & Physiology#Function - Hearing|sound]] and [[Nose - Anatomy & Physiology|scent]]. Each of these has certain advantages and disadvantages for communi ...litary hunters and do not need to manage the sharing of food resources and reproductive opportunities. Fights between cats impair their fitness and ability to hunt