Skeleton of the Fin Whale (Baelenoptera musculus)

Fin whales are the second-longest animal in the world, and second-largest, after the blue whale. They travel significantly faster than blue whales in open ocean, but were (and are) hunted just as much, if not more, than their rorqual counterparts. There are estimated to be 38,000 alive today.

Frogs.

From top downward:

Hyla cruicifer, (spring peeper) light and dark color phases 

Hyla versicolor, (“tree toad”) light color phase

Rana clamitans, (green frog) male and female - male with larger eardrum (above female)

Field Book of Ponds and Streams. Ann Haven Morgan, PhD., 1930.

Top to bottom:

1. Adult spotted newt
2. Red phase of above, usually found on land
3. Larva of above
4. Two-lined salamander
5. Dusky salamander
6. Spotted salamander

Field Book of Ponds and Streams. Ann Haven Morgan, PhD. 1930.