breeding programme - male and female animals are chosen to mate in zoos, compete - when males fight or display to impress a female, dominant - stronger, fertile - is able to have young, pregnant - fertilisation and implantation has occurred, captivity - living in an artificial place like a zoo. Not in the wild, enclosures - fenced off area like a cage, concieve - become pregnant, physiology - body structure, estrus - time the animal is fertile (can get pregnant), hormones - chemicals in the body , artificial insemination - when sperm collected from a male is placed into the female, often with a syringe, veterenarians - animal doctors, pseudopregnancy - pretend pregnancy, ultrasound - a type of scan that can see inside the body, implant - when the fertilised egg sticks to the wall of the womb, uterus - womb, the place a baby develops, delivery - giving birth,

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