We don't have an exact birthdate for Flemish artist Jan van Kessel the Elder, but he was baptised #OTD (5 Apr 1626 - d. 17 April 1679) so here are three versions of his caterpillars and snakes signature (+some bonus spiders for #BeKindToSpidersWeek):
Jan van Kessel the Elder (Flemish, 1626–1679) "Garden and house spiders with grass snakes and caterpillars contorted and entwined to spell the artist's name" 1657 oil painting on copper H 15 cm (5.9 in) x W 20 cm (7.8 in) Sothebys
Jan van Kessel the Elder (Flemish, 1626–1679) The Four Continents: The Continent of Europe [detail of the signature panel] c. 1660s oil painting on copper H 48.4 cm (19 in) x W 67.1 cm (26.4 in) Alte Pinakothek
Jan van Kessel the Elder (Flemish, 1626–1679) "Seventeen panels depicting snakes, lizards, flowers, caterpillars, beetles, butterflies and other insects" [detail including the signature panel] 1658 oil painting on copper, 39 x 56 cm (15 x 22 in) and 14 by 19 cm (5.5 x 7.5 in) Oak Spring Garden Foundation, Upperville, call no. NW-UL-NW
You can read more about this creative signature, and see his son Ferdinand's version too, here: