VII. Rhythm of Life – Biological Clock – internal timer of organisms to stay in step with the rhythmic cycles of change in environment
A. Lunar – changes that happen in a month or together with the phases of the moon
1. Low Tide: fiddler crab, starfish, worms, grunion
2. High Tide: mussels, barnacles, snails, sea anemone etc.
B. Daily – change everyday
1. Diurnal – active during day (flamingo)
2. Nocturnal – active during night (bat, bush baby owl, wolf, rhino, moth, hyena, tree frog, heron, nighthawk, night blooming cereus, dama de noche, old man cactus, daylilies, glasswing butterfly, dumpling)
3. Crepuscular – active during twilight (rabbit, cat, dog, vole, platypus, deer bear, gila monster, rattlesnake, mosquito, wallaby, firefly)
C. Annual – happens in more or less a year
1. Migration – birds, snow goose, wildebeest, whales, salmon
2. Hibernation – squirrels, hedgehog
3. Estivation – toad, lungfish
4. Autumn changes - trees, chrysanthemum
5. Spring changes – poppy, marigold
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