Vertebrate Hearts - Comparative Clip ArtHappy Valentine's Day! Please enjoy clipart set, which I've listed for free in honor of the holiday :) This clipart set includes 6 examples of vertebrate hearts, along with a representative from each corresponding clade. A heart image for fish, amphibians, turtles, crocodilians, birds, and mammals are all represented. Each image is given in color, line art, and white-filled versions, for a total of 37 images.This resource is great for nature centers or sci