HAIR = FUR (For the next exercise)
Advertencia: para el próximo ejercicio hay que clasificar fila a fila (pez-iguana y salamandra en la primera fila, tortuga, rana y pez en la fila de abajo)
Warning: for the next exercise you must classify row by row (fish-iguana-salamander in the first row, then turtle, frog and fish in the second row).