ZOOLOGICAL TERMS. 2.                                                                                                ZT2.
TIME OF ACTIVITY.
NOCTURNAL.           ANIMALS MAINLY ACTIVE BY NIGHT. BADGERS, OWLS,  FOX, KINKAJOU, ETC.
DIURNAL.                  ACTIVE BY DAY, SLEEPING AT NIGHT. MAN, FALCON, HAWK, APE, PRIMATE, ECT.
CREPUSCULAR.       ACTIVE AT DAWN AND DUSK, LIKE BATS (FLYING FOX'S) AND SOME BIRDS LIKE THE WOODCOCK.
 HIBERNATION. A CHANGE INSIDE THE ANIMAL WHICH PUTS IT TO SLEEP IN WINTER.  IN THIS STATE THE ANIMAL FEEDS WHILE ASLEEP ON ITS OWN STORED BODY FATS,HEARTBEAT AND RESPIRATION ARE SLOWED RIGHT DOWN, AND BODYTEMPERATURE DROPS. IT IS A STATE THE ANIMAL CANNOT  HELP.
AESTIVATION.         THIS IS A MATTER OF CHOICE, NOT LIKE HIBERNATION. AN ANIMAL MAY CHOOSE TO SPEND SOME TIME HIDINGFROM THE SUN IN TROPICAL COUNTRYS.
REPRODUCTION,     GROWTH AND DEVELOPMENT.
SEX DIMORPHISM.  WHEN MALES AND FEMALES OF A SPECIES HAVE  DIFFERENT COLOURS. LIONS ARE EXAMPLES OF SEX DIMORPHISM, ROBINS AND THRUSHES ARE NOT.
VIVIPAROUS.            BEARING LIVE YOUNG AS DO MAMMALS, SOME FISH (MOLLIES, PLATYS, AND GUPPYS.) AND SOME REPTILES, (ADDERS).
OVIPAROUS              LAYING EGGS IN WHICH THE YOUNG DEVELOP, BIRDS REPTILES AMPHIBIANS, MOST FISH AND INVERTEBRATES.
GESTATION.              IN MAMMALS, THE LENGTH OF TIME IT TAKES FOR THE YOUNG TO DEVELOP INSIDE THE MOTHER FROM THE MOMENT OF FERTILIZATION UNTIL BIRTH.
INCUBATION.           IN BIRDS, REPTILES THE LENGTH OF TIME IT TAKES FOR THE YOUNG TO DEVELOP WITHIN THE EGG FROM THE MOMENT OF FERTILIZATION UNTIL BIRTH.
PRECACIOUS.           ANIMALS CAPABLE OF RUNNING AROUND SHORTLY AFTER BIRTH, GUINEA PIGS CAN RUN AROUND ABOUT ONE HOUR  AFTER BIRTH.
METAMORPHOSIS.  SOME ANIMALS MUST CHANGE THEIR FORM ONE OR MORE TIMES BEFORE BECOMING ADULT. EXAMPLE: THE METAMORPHOSIS OF THE BUTTERFLY ARE: EGG, LARVA, (OR CATERPILLAR) PUPA (OR CHRYSALIS),   ADULT.  MOST INVERTEBRATES HAVE SOME KIND OF  METAMORPHOSIS. AMPHIBIANS ARE GOOD EXAMPLES OF ANIMALS WITH A METAMORPHOSIS.