territory feeding reproduction hummingbird migration nectar sunbird habitat seashore egg shrub blackcap conflict groom displacement activity redirected behavior patch optimality principle nutrition snail evolution organ predator prey green turtle starfish digest generalist specialist starvation rat eucalypt kangroo rat koala physiological structure population leader level individual wolf deer beaver branch lizard flee possibility magnetic strength frequency prominent accomplished courtship bioacoustics infrasound violoncello shelter moth bot echolocation barrier vision sound wave detect predator ultrasonic visible invisible signal rainforest mimic frog toad reptile gibbon communication model mating primates baboon gorilla chimpanzee dolphin whistle identify sonar compound eyes simple eyes
| crab field of vision gravity buoyancy drag tuna black fish caudal fin function zebra gazelle ruminate non-ruminate ruminant stomach stem leaves horn antler skin bone mammal sense organ nerve rattlesnake infrared pit trichromatic monochromatic dichromatic conduction mechanism blubber polar bear endotherm ectoderm metabolism crocodile gather food cochlea inner ears spit consistency feedstuff sensitivitycrab field of vision gravity buoyancy drag tuna black fish caudal fin function zebra gazelle ruminate non-ruminate ruminant stomach stem leaves horn antler skin bone mammal sense organ nerve rattlesnake infrared pit trichromatic monochromatic dichromatic conduction mechanism blubber polar bear endotherm ectoderm metabolism crocodile gather food cochlea inner ears spit consistency feedstuff sensitivity | sac lymph solute passive transport active transport freshwater fish sea fish gill urine leatherback limb flipper heat preservation whale keystone species ecosystem fur marine mammal seal snout hibernation octopuschromatophore ink sac pigment shrink jellyfish gland carbon monoxide opossum marsupial placenta skeleton reptile carnivore salmon hatchery gene pool genetic diversity reindeer migrate tissue alimentary canal lichenmollusk marine biology shell pearl gastropod bivalvia spider web cob web symmetry asymmetry field research irregular radiate decorate growth positive over exploration habitat aye-aye ape white tail deer high land bottomland jungle legislation lethal gravel earthworm horizontal vertical burrow intelligence quotient intellect magnetic field physiological cerebra primary emotion secondary emotion |