1st Animal Classification

Vertebrate(with backbone):

Fish
 -have fins
 -skin cover with scales

Bird
 -have feathers
 -have 2 wings to fly
 -have beak

Amphibians
 -use their skin as a secondary respiratory surface
 -they are often ecological indicators
 -egg firtilized outside the female body

Reptiles
 -lay egg on land
 -having skin covered with scales or horny plates
 -breath with lungs

Mammals
 -whose young feed by milk
 -red blood cells that lack a nucleus
 -covering hair on some or most of the body