Ron Morris Special Correspondent With springtime well underway, weâre in a season that offers so many opportunities to witness first-hand many of natureâs marvels, from the beauty of birdsong, to the architecture of nests, to the behaviors of birds as they court mates, rear young and more. The varieties of size, shape and color of bird eggs are among those marvels, ranging from the miniscule hummingbird egg (the size of a coffee bean) to the enormous eggs of ostriches (equal in weight to 20 chicken eggs). Itâs not surprising that the smallest bird in the world produces the smallest egg and the largest bird produces the largest egg. But hummingbirds and ostriches illustrate an even more substantive difference, the degree of development of the newly hatched chick.