I haven't been to Turtle Back yet, but I've been planning on it and have looked at plenty of photos, species lists, etc, just haven't had the time to do the longer drive. I've been to LHV numerous times in the last year.
I'm surprised this is even a debate. The only thing I really love about Lehigh is the stunning location. Species-wise their only thing above average is their Fisher; everything else is fairly common even in the area. The only other one I'd mention is the Ringtail, which is in an outdoor exhibit and is rarely seen by visitors. The next closest zoo, ZooAmerica, has Ringtails in a night exhibit where they're active. Their penguin exhibit is nice for the size of the zoo, and I like their wolf exhibit.
Some of their exhibits are rather poor quality, with several ranking among the worse I've seen at an AZA establishment. Their fox is incorrectly identified, as well as one of the horses.
Their encounter/behind-the-scenes prices are absurd. Each are 1-4 people: Armadillo, Crowned Crane, Bird of Prey, or Raccoon $199, Giraffe painting (only one painting) $350, Penguin or Sloth $400.
Turtle Back's vary by season, but are rarely more than $50, including admission.
I can't think of a single metric where Lehigh comes out above TBZ.
Giraffes:
(Turtle Back's giraffes:
Giraffe Exhibit at Turtle Back Zoo | French & Parrello Associates)
"Palomino" Horse (2 horses, one of which is a chesnut, not a palomino):
Aoudad:
Zebra and Ostrich:
Kookaburra:
River Otter:
Penguins:
