Metamorphosis leads to a wide range of evolutionary outcomes. The dramatic transformation of a caterpillar into a butterfly ...

Black Swallowtail butterfly caterpillar eating his molted skin for extra nutrition. The caterpillar is white with black and yellow ends (stripes). The caterpillar is horizontal in the frame, facing ...

Ecdysis is a word that refers to when reptiles and insects shed their old layers of skin or outer cuticles. Conceptually, the word speaks to rebirth, or better yet, a renewal, which sums up the ...

A NEED has been felt for a precise terminology to distinguish four types of animal hormones by their actions 1,2. (1) ‘Metabolic’ hormones stimulate or inhibit clearly defined metabolic processes.

Caterpillars shed their skin several times as they grow, and in the final stage of metamorphosis, they form their pupa (chrysalis). As the warm summer and spring suns arrives, it signals a change in ...