Question

Using the comparatives with adjectives, describe the farm animals in the pictures using at least 4 different sentences in Spanish. a cow and a calf a chicken a horse a pig a yellow chick

Answer 1

Cow = Vaca, Calf = Becerro, Chicken = Gallina, Horse = Caballo, Pig = Cerdo, Yellow Chick = Gallina amarillo.
 Comparatives with adjectives is just an adjective but something more so instead of Good in English you would say execellent. 
 The Cow is grande. Using the Comparative adjective for grande you would say, La vaca es mayor que el gallina armarillo. (The cow is bigger than the yellow chicken.)

Answer 2

En la granja es el caballo de gallina de ternera