Fight, Flight, or FREEZE

When a predator approaches, options are limited – especially if you’re a tadpole. The woodfrog tadpole (Rana sylvatica) is known to stop swimming and sink to the pond bottom, an action called “freezing behavior.”

In one study, researchers exposed woodfrog embryos to some water from a predator’s tank with or without an injured tadpole (1). When the embryos hatched, the ones that had smelled both the predator and injured relative showed very reduced activity (freezing behavior) if re-exposed to just predator-water.

In mice, freezing behavior is affected by the size and speed of an object. Video showing lab mice exposed to various dots indicates that small, slow objects trigger mice to freeze. When exposed to terrifying large dots, mice take off.

1. Mathis, A., M.C.O. Ferrari, N. Windel, F. Messier, and D.P. Chivers. 2008. Learning by embryos and the ghost of predation future. Proc Biol Sci. 275(1651): 2603-2607.

 

Playful Kittens

Play. It’s well-documented in many mammals and birds. Fish have also been observed leaping over sticks and batting around balls.  Frogs play-wrestle and tadpoles ride bubbles. Turtles play tug-of-war (1). Some invertebrates even play. Octopuses, and possibly spiders and wasps, have shown play behaviors too (2).

Welcome to our new playful kittens, adopted from SAFE Haven.

1. Burghardt, G.M. 2015. Play in fishes, frogs, and reptiles. Current Biology. 25(1) R9-10
2. Zylinski, S. 2015. Fun and play in invertebrates. Current Biology. 25(1) R10-11