Blenny fish come in many shapes, sizes and colours. New Scientist is reporting on the extraordinary behaviour of blennies living in the waters of Rarotonga, the largest of the Cook Islands:
“At low tide, blennies are commonly found swimming in rock pools around the edges of the island. But when high tide moves in, they climb up to dry land and shuffle around the rocks until the tide retreats.”
So, the fish are not moving permanently to land; they only spend some time out of the water, just like mudskippers do.
Some evolutionists thought they saw superfast evolution in mudskippers, but they forgot that these fish would dry out if they didn’t return to the sea.
Like mudskippers, blennies use gills to breath which are good for breathing in water but not so good on land. If they tarry too long on dry land, they will eventually die.