Why do warblers sing to attract a mate instead of using display?

Can half a drop of coke kill a budgie? Are damselfish aggressive? Tiny muscles attached to hair follicles that pull the hair upright during fright or cold? What is geothemal energy? Is a platerpus a marsupile? How are fry born from a female betta? Do most warm blooded animals take care or their young and cold blooded ones don't? What is the optimal temperature for dogs and how can pet owners ensure their furry friends are kept comfortable in varying weather conditions? What is the masculine for colt? Can you go to jail if you kill a beluga whale? What preventative measures can be taken to ensure the health and well-being of dogs? Do animals cry and what animals? Are collagen fibers inelastic? What do you call a group of sand hill cranes? Why do tazmanian devils have cushained feet? What are helpful mutations Has to be a mutation that exists on earth for a fire breathing monkey living in the alpine region? Can double or triple yokes be fertile? How much is a patriae ag humanitati? Do dogs have fur, and if so, what is the purpose of their fur in relation to their overall health and well-being? Where do swans go to die n ever see a dead swan?